#include<bits/stdc++.h>
using namespace std;
int main(){
    int c;
    cin>>c;
    float   f;
    f=9.0/5*c+32;
    printf("%.2f",f); 
}
/**************************************************************
	Problem: 1031
	User: zhengyuxuan
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/