#include<bits/stdc++.h>
using namespace std;
int c,f;
int main(){
    cin>>c;
    printf("%.2lf",9.0/5.0*c+32.0);
    return 0;
}
/**************************************************************
	Problem: 1031
	User: chenmingyu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/