#include<stdio.h> //#include<math.h> //#include<string.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("N0\n"); else { n*=1000; time=(double) n/(v1-v2); if(time<=t) printf("%.2lf\n",time); else printf("N0\n"); } } return 0; } |
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