#include<bits/stdc++.h>
using namespace std;
int main(){
    double a;
    cin>>a;
    double y=5*(a-32)/9;
    cout<<"c=";
    printf("%.2lf",y);
    return 0;
}

C :

#include <stdio.h>
int main()
{
 float F,c;
 scanf("%f",&F);
 c=5*(F-32)/9;
 printf("c=%.2f\n",c);

}

C++ :

#include <bits/stdc++.h>
using namespace std;
float n;
int main()
{
    cin>>n;
    printf("c=%.2f",5*(n-32)/9);
    return 0;
}