#include <stdio.h>

void main(void){
	int t = 0;
	scanf("%d",&t);
	int stressFree[t];
	int a,b;
	for(int i = 0; i < t ; i++){
		scanf("%d %d",&a,&b);
		stressFree[i] = a*b + b;
	} 
	for(int i = 0; i < t ; i++){
		printf("%d\n",stressFree[i]);
	} 
}