题解

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,m,x;
	cin>>n>>m>>x;
	int time1=5+n+15;//客梯
	int time2=10+m+15;//货梯
	int time3=17+15;//走路
	int minv=min(time1,min(time2,time3));
	if(minv<=x) cout<<"on time";
	else cout<<"late"; 
	return 0;
}