#include <stdio.h>

int main(){
    long long x;
    int y,T;
    scanf("%d",&T);
    for(int i=0;i<T;i++){
        scanf("%lld %d",&x,&y);
        if(x>=y){
            long long k=(x/y);
            printf("%lld\n",(k+1)*y);
            continue;
            }
        else{
            printf("%d\n",y);
            continue;
        }
    }
}