#include <stdio.h> int main(){ int s1,s2,n,v1,v2,t; float k,v,tt; while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!= EOF){ k=n*1000; s1=v1*t; s2=k+v2*t; if(s1<s2) printf("NO\n"); else { v=v1-v2; tt= k/v; printf("%.2f\n",tt); } } return 0; } |
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