#include<stdio.h> int main() { float va, vb,n, t; float s, shi; while (scanf("%f%f%f%f", &n, &va, &vb, &t)!=EOF) { if (n == 0) printf("0.00\n"); else { if (vb >= va) printf("NO\n"); else { shi = n * 1000 / (va-vb); if (shi <= t) printf("%.2f\n", shi); else printf("NO\n"); } } } return 0; } |
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