diff --git a/atcoder/abc064/A/main.cpp b/atcoder/abc064/A/main.cpp
new file mode 100644
index 00000000..26ff88ce
--- /dev/null
+++ b/atcoder/abc064/A/main.cpp
@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    int r, g, b;
+    cin >> r >> g >> b;
+    int rgb = r * 100 + g * 10 + b;
+    if (rgb % 4 == 0) {
+        cout << "YES" << endl;
+    } else {
+        cout << "NO" << endl;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/atcoder/abc064/B/main.cpp b/atcoder/abc064/B/main.cpp
new file mode 100644
index 00000000..435a8821
--- /dev/null
+++ b/atcoder/abc064/B/main.cpp
@@ -0,0 +1,27 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int N;
+vector<int> A;
+
+int solve() {
+    int mini = *min_element(A.begin(), A.end());
+    int maxi = *max_element(A.begin(), A.end());
+    return maxi - mini;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    cin >> N;
+    A.assign(N, 0);
+    for (int i = 0; i < N; ++i) {
+        cin >> A[i];
+    }
+    cout << solve() << endl;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/atcoder/abc064/C/main.cpp b/atcoder/abc064/C/main.cpp
new file mode 100644
index 00000000..f783ef30
--- /dev/null
+++ b/atcoder/abc064/C/main.cpp
@@ -0,0 +1,40 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int N;
+vector<int> A;
+
+vector<int> solve() {
+    int K = 0;
+    unordered_set<int> S;
+    for (auto a : A) {
+        if (a < 400) S.insert(0);
+        else if (a < 800) S.insert(1);
+        else if (a < 1200) S.insert(2);
+        else if (a < 1600) S.insert(3);
+        else if (a < 2000) S.insert(4);
+        else if (a < 2400) S.insert(5);
+        else if (a < 2800) S.insert(6);
+        else if (a < 3200) S.insert(7);
+        else ++K;
+    }
+    if (S.empty()) return { 1, K };
+    return { (int)S.size(), (int)S.size() + K };
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    cin >> N;
+    A.assign(N, 0);
+    for (int i = 0; i < N; ++i) {
+        cin >> A[i];
+    }
+    auto minmax = solve();
+    cout << minmax[0] << " " << minmax[1] << endl;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/atcoder/abc064/D/main.cpp b/atcoder/abc064/D/main.cpp
new file mode 100644
index 00000000..048f7c6e
--- /dev/null
+++ b/atcoder/abc064/D/main.cpp
@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int N;
+string S;
+
+string solve() {
+    deque<char> Q;
+    int k = 0;
+    for (auto c : S) {
+        if (c == '(') {
+            Q.push_back(c);
+            k++;
+        } else if (c == ')') {
+            Q.push_back(c);
+            if (k > 0) --k;
+            else Q.push_front('(');
+        }
+    }
+    while (k > 0) {
+        Q.push_back(')');
+        --k;
+    }
+    return string(Q.begin(), Q.end());
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    cin >> N >> S;
+    cout << solve() << endl;
+
+    return 0;
+}
\ No newline at end of file