Find minimum number without using Comparison Operator

#include "stdafx.h"
#include<iostream>
using namespace std;
int main()
{
int num1,num2,num3;
cout<<"Please enter three numbers :\n";
cin>>num1>>num2>>num3;
int min=0;
while(num1 && num2 && num3)
{
num1--;num2--;num3--;min++;
}
cout<<"Minimum is "<<min<<"\n";
return 0;
}