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#include <iostream>
using namespace std;
int main()
{
    int a,b,c,d,t1,t2,t3;
    cin >> a >> b >> c >> d;
    t1 = (c - a)*60;
    t2 = d - b;
    t3 = t1 + t2;
    cout << t3;
}

#include <iostream>
using namespace std;
int main()
{
    int a,b,c,d;
    cin>>a;
    cin>>b;
    cin>>c;
    cin>>d;
    if (a==c)
        cout<<d-b;
    else
        cout<<(c-a-1)*60+d+(60-b);
    return 0;
}