#include <stdio.h> int main(){ double f,C; scanf("%lf",&f); C=5*(f-32)/9; printf("%.5lf",C); }

#include<stdio.h> int main() { double F = 0; double c =0; scanf("%lf", &F); F >= -459.67; c = 5 * (F - 32) / 9; printf("%.5lf\n", c); return 0; }