hdu 2504

#include <stdio.h>int GCD(int a,int b){return b?GCD(b,a%b):a;}int main(void){int n;scanf("%d",&n);while(n--){int a,b,c=0;scanf("%d%d",&a,&b);while(++c){if(c==b)continue;if(GCD(a,c)==b)break;}printf("%d\n",c);}return 0;}