atcoder/abc186C

Author: xirc

atcoder/abc186/C/main.cpp

@@ -0,0 +1,39 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = int64_t;
+using ff = long double;
+
+bool contains7_on_10base(int N) {
+    while (N > 0) {
+        if (N % 10 == 7) return true;
+        N /= 10;
+    }
+    return false;
+}
+
+bool contains7_on_8base(int N) {
+    while (N > 0) {
+        if (N % 8 == 7) return true;
+        N /= 8;
+    }
+    return false;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    int N;
+    cin >> N;
+
+    int ans = 0;
+    for (int i = 1; i <= N; ++i) {
+        if (contains7_on_10base(i)) continue;
+        if (contains7_on_8base(i)) continue;
+        ++ans;
+    }
+    cout << ans << endl;
+
+    return 0;
+}