View Code of Problem 104

#include<stdio.h>
int main()
{
	int n,v1,v2,t;
	float T;
	while(scanf("%d%d%d%d",&n,&v1,&v2,&t)!=EOF)
	{
		if(((v1-v2)*t)<(n*1000))
			printf("NO\n");
		else
		   {
		   	T=(float)n*1000/(v1-v2);
		   	printf("%.2f\n",T);
		   }
	}
	return 0;
}