Euler phi function

#include<iostream>
using namespace std;

int phi(int n)
{
    int result=n;

    for(int i=2;i*i<=n;i++){
        if(n%i==0){
            while(n%i==0)
                n/=i;
            result-=(result/i);
        }
    }
    if(n>1)
        result-=(result/n);

    return result;
}


int main()
{
    int i;
    while(1){
        cin>>i;
        cout<<"Value of phi("<<i<<") : "<<phi(i)<<endl;
    }

    return 0;
}