#include<bits/stdc++.h>
using namespace std;
int main(){
    int c;
    double f;
    scanf("%d",&c);
    f=9/5.0*c+32;  
    printf("%.2f",f);
    return 0;
}  
/**************************************************************
	Problem: 1031
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2076 kb
****************************************************************/