#include<stdio.h> int main(){ float n,v1,v2,t; while(scanf("%f%f%f%f",&n,&v1,&v2,&t)!=EOF){ float t1; if(v2>v1) printf("NO\n"); else{ t1=1000*n/(v1-v2); if(t1<=t) printf("%.2f\n",t1); else printf("NO\n"); } } } |
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