刚开始学python求最小公倍数为什么结果返回不对

Question

while True:
    try:
        a=int(input('输入数字a: '))
        b=int(input('输入数字b: '))
        if a>0 and b>0:
            break
    except ValueError:
        print('请输入整数')
def gbs(x,y):
    c=min(x,y)
    d=x*y
    for i in range(c,d+1):
        if ((i%x==0) and (i%d==0)):
            gbs=i
            break
    return gbs
print ( '{0}和{1}的最小公倍数：{2}'.format(a,b,gbs(a,b)))