#include<iostream> #include<cstdio> #include<string> #include<cstring> #include<cmath> #include<algorithm> #include<iomanip> #include<stack> #include<queue> #include<vector> #include<map> #include<set> using namespace std; int main(){ double a,b; cin>>a; b=(a-32)*5/9; printf("%.2f",b); return 0; }