#ifndef FUNCTION13_H_
#define FUNCTION13_H_
int box_volume (int length, int width, int height);

#include <bits/stdc++.h>
using namespace std;

int main ()
{
    int n;
    cin >> n;

    long long sum = 0;
    for (int i = 0; i < n; i++)
    {
        int a, b, c;
        cin >> a >> b >> c;
        sum += box_volume(a, b, c);
    }

    cout << sum << '\n';
}
#endif