#include<bits/stdc++.h>
using namespace std;
int main()
{
    float f,c;
    cin>>c;
    f=9.0/5*c+32;
    printf("%.2f",f);
    return 0;
}

/**************************************************************
	Problem: 1031
	User: hbq
	Language: C
	Result: Compile Error
****************************************************************/