#include<bits/stdc++.h>
using namespace std;
int main(){
	int sh,sm,eh,em;
	cin>>sh>>sm>>eh>>em;
	int t = 0;
	t = (eh-sh)*60+em-sm;
	cout<<t;
	return 0;
}

#include <iostream>
using namespace std;
int main(){
    int hour,min,end_hour,end_min;    
    cin>>hour>>min>>end_hour>>end_min;
    int total=hour*60+min;
    int end_total=end_hour*60+end_min;  
    int minutes=end_total-total;
    cout<<minutes<<endl;   
    return 0;
}

#include using namespace std; int main() { int t,i,m,e; int x=0,y=0; cin>>t>>i>>m>>e; x=(m-t)*60; y=e-i; cout<<x+y;

}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c,d,h,m,s=0;
    cin>>a>>b>>c>>d;
    if(d>=b)
    {
        h=c-a;
        m=d-b;
    }
    else
    {
        h=c-a;
        m=60-(b-d);
        h--;
    }
    s+=h*60;
    s+=m;
    cout<<s;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int sh,sm,eh,em;
	cin>>sh>>sm>>eh>>em;
	int t = 0;
	t = (eh-sh)*60+em-sm;
	cout<<t;
	return 0;
}