#include <iostream>
using namespace std;
int main() {
    int h1, m1, s1;
    cin >> h1 >> m1 >> s1;
    int h2, m2, s2;
    cin >> h2 >> m2 >> s2;
    int y= h1 * 3600 + m1 * 60 + s1;
    int h = h2 * 3600 + m2 * 60 + s2;
    int p = y - h;
    cout << p << endl;

    return 0;
}