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