#include<iostream>
#include<sstream>
#include<algorithm>
#include<cstdio>
#include<string.h>
#include<cctype>
#include<string>
#include<cmath>
#include<vector>
#include<stack>
#include<queue>
#include<map>
#include<set>
using namespace std;
int main() {
  int t; scanf("%d", &t);
  while(t--) {
    int n, m;

    scanf("%d%d", &n, &m);
    if(n == 1 && m== 1) {
        printf("0\n");
    }
    else
    printf("%d\n", n/2 + m/2);
  }
  return 0;
}