View Code of Problem 104

#include<iostream>
using namespace std;
int main(){
	int n,v1,v2,t;
	while(cin>>n>>v1>>v2>>t){
		float s;
		if(v1-v2>0){
			s=(float)n*1000/(v1-v2);
			if(s<=t){
				printf("%.2f",s);
			}
			else cout<<"NO"<<'\n';
			
		}
		else cout<<"NO"<<'\n';
	}
}