#include <iostream>
using namespace std;
int main() {
    int sum = 0, count = 0;
    for(int i=1; i<=15; i++){
        if(i % 3 == 0 && i % 5 != 0){
            count++;
            sum += i;
        }
    }
    cout << count + sum << endl;
    return 0;
}