#include <iostream>
#include <iomanip>

int main() {
    int c;
    std::cin >> c;
    double f = 9.0 / 5 * c + 32;
    std::cout << std::fixed << std::setprecision(2) << f << std::endl;
    return 0;
}    
/**************************************************************
	Problem: 1031
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/