#31169: FEVER
#include <stdio.h>
#include <stdlib.h>
int main()
{
double F,C;
scanf("%lf",&F);
C=(F-32)*5/9;
printf("%.3lf",C);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
int main()
{
double F,C;
scanf("%lf",&F);
C=(F-32)*5/9;
printf("%.3lf",C);
return 0;
}