#include<bits/stdc++.h> using namespace std; int main() { int N; cin>>N; int c; int sum = 0; for (int n = 4; n <= N; n++) { c = 0; for (int i = 2; i < n; i++) { if (n % i == 0) { c++; } } if (c != 0) { sum = sum + n; } } cout << sum; return 0; }