C++ :

#include <iostream>
using namespace std;
int main() {
    int n, sum = 0;
    cin >> n;
    int i = 2;
    while (i <= n) {
        bool isPrime = true;
        int j = 2;
        while (j <= i / 2) {
            if (i % j == 0) {
                isPrime = false;
                break;
            }
            j++;
        }
        if (isPrime) sum += i;
        i++;
    }
    cout << sum;
    return 0;
}