View Code of Problem 104

#include<stdio.h>
int main()
{
	int n,v1,v2,t;
	double time;
	while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF)
	{
		if(v1<=v2)
		{
			printf("NO\n");
		}	
		else
		{
			time=n*1000.0/(v1-v2);
			if(time>t)
			{
				printf("NO\n");
			}
			else
			{
				printf("%.2f\n",time);
			}
		}
	}
	return 0;
}