#include <iostream>
using namespace std;
int main(int argc, char* argv[]) {
    int Score[6];
    for (int i = 0; i < 6; i++)
        cin >> Score[i];
    int t = 0;
    t += Score[0];
    t += Score[1];
    t += Score[2];
    t += Score[3];
    t += Score[4];
    t += Score[5];
    cout << t;
}