Picture Perfect

#include <iostream>
#include <math.h>
using namespace std;

int main() {
	double x;
	int d1,d2,per;
	while (true) {
		cin >> x;
		if (x == 0) {
			break;
		}
		int n = (double) x;
		int a = sqrt(x);
		for (int i = 0; i < n; i++) {
			if (n%a+i == 0) {
				d1 = a+i;
				d2 = (int)n/d1;
				per = d1*2 + d2*2;
			}
		}
		cout << "Minimum perimeter is " << per << " with dimensions " << d1 << " x " << d2 << endl;
	}
}