#include<bits/stdc++.h>
using namespace std;
int main(){
    int c;
    scanf("%d",&c);
    double f=9.0/5*c+32;
    printf("%.2f",f);
    return 0;
}
/**************************************************************
	Problem: 1031
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/