import java.util.*; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while(scanner.hasNext()) { int n = scanner.nextInt(); int v1 = scanner.nextInt(); int v2 = scanner.nextInt(); int t = scanner.nextInt(); if(v1 < v2) { System.out.println("NO"); }else { if((v1-v2) * t < n*1000 ){ System.out.println("NO"); }else { double time =(double)n*1000 / (v1 - v2); System.out.println(String.format("%.2f", time)); } } } } } |
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