using System;
public class Program
{
static bool KiemtraSNTo(int n)
bool KQ=true;
if(n<2) KQ=false;
for(int i=2;i<=n/2;i++)
if(n%i==0)
KQ=false;
break;
}
return KQ;
static int UocSoChungLonNhat(int a, int b)
while(a*b!=0)
if(a>b)
a = a - b;
else
b = b - a;
return (a+b);
public static void Main()
Console.WriteLine(UocSoChungLonNhat(33,11));