求最小公倍数，但是程序显示错误

#include<stdio.h>

int main()
{
    int a, b;
    while (scanf("%d %d", &a, &b)!=EOF)
    {
        int gcd, lcm;
        int temp,a1=a,b1=b;
        do
        {
            temp = a1 % b1;
            a1 = b1;
            b1 = temp;
        } while (b1 > 0);
        gcd = a1;
        lcm = (a * b) / gcd;
        printf("%d\n", lcm);
    }
    return 0;
}

我运行没有问题