#include<stdio.h>main(){ int n1,n2,r,x; scanf("%d%d",&n1,&n2); if(n1<n2) {x=n1;n1=n2;n2=x;} r=n1%n2; while(r!=0) { n1=n2; n2=r; r=n1%n2; } printf("%d",n2);}求两个数的最大公约数