View Code of Problem 104

#include<bits/stdc++.h>
using namespace std;
 
int main(){
    int n,v1,v2,t;
    while(cin>>n>>v1>>v2>>t){
    	if(v1 <= v2) cout<<"NO"<<endl;
    	else{
    		double t1=(double)(n*1000)/(v1-v2);
    		if(t1 >= t) cout<<"NO"<<endl;
    		else printf("%.2lf\n",t1);
		}
	}
}