#include <iostream> using namespace std; int main() { int x1,y1,x2,y2; cin>>x1; cin>>y1; cin>>x2; cin>>y2; int t1=x1*60+y1; int t2=x2*60+y2; int r=t2-t1; if(r<0){ r+=24*60; } cout<<r; return 0; }