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#include<iostream>
int main(){
	int x,d,h,m;
	std::cin>>x>>d>>h>>m;
	if(x!=5)
		std::cout<<(23+x-d)*24*60+(24-h)*60-m<<std::endl;
	else
		std::cout<<(29-d)*24*60+(24-h)*60-m-(!(d==29&&h>2))*60<<std::endl;
	return 0;
}