#include<iostrean>
#include<iomanip>
using namespace std;
class Te{
    public:
    double c;
    double f(){
        return (C*9/5)+32;
    }
    
};
int main(){
    double i;
    cin>>i;
    if(i<0){
        cout<<"Invalid input"<<endl;
    }
    else{
        Te t;
        t.c=i;
        cout<<t.f()<<endl;
    }
    return 0;
}