#include<stdio.h> long long gcd(long long a,long long b) { if(b==0) { return a; } return gcd(b,a%b); } int main() { long long int a,b;//只能定义为long long类型,不能为int类型, scanf("%lld%lld",&a,&b); printf("%lld\n",a/gcd(a,b)*b); //注:在此题中不能写成a*b/gcd(a,b) return 0; }