#include <iostream>
using namespace std;
int main(){
	int h,m,s,k;
	cin>>h>>m>>s;
	cin>>k;
	int a=h,b=m,c;
	c=s+k;
	for(c;c>=60;c=c-60) {
			b=b+1;
	}
	for(b;b>=60;b=b-60){
		a=a+1;
	}
		cout<<a<<""<<b<<""<<c;
		return 0; 
	}