#include<iostream> using namespace std; int main(){ int a,b,c,d,e,f; cin>>a>>b>>c>>d; e=a60+b; f=c60+d; cout<<f-e; return 0; }

#include <bits/stdc++.h> using namespace std; int sh,ss,th,ts; int main(){ cin >> sh >> ss >> th >> ts; cout <<th60+ts-(sh60+ss); return 0; }