#include using namespace std; int countNonRelated(int n) { int count = 0; for (int i = 1; i <= n; i++) { int num = i; bool related = false; while (num > 0) { if (num % 10 == 7) { related = true; break; } num /= 10; } if (i % 7 != 0 && !related) { count++; } } return count; } int main() { int n; cin >> n; cout << countNonRelated(n) << endl; return 0; }