PAT B1001害死人不偿命的（3n+1）猜想

#include <iostream>
using namespace std;

int main(void)
{
    int n, step = 0;
    cin >> n;
    while(n != 1){
        if ( n % 2 == 0 ){
            n /= 2;
        } else {
            n = ( 3 * n + 1 ) / 2)
        }
        step++;
    }
    cout << step;
}