#include <cstdio>
int solve( int start , int i) {
    int times = 1,s;
    if(start == 1) times = 15;
    else if(start == 2) times = 150;
    else {
        times = 750;
        start = start - 3;
        while(start--) {
            times *= 10;
        }
    }
    if(start == 2) {
        if( i % 4 == 0)
            s = (i + i/4 - 1)*times;
        else
            s = (i + i/4)*times;
    } else {
        if( i % 9 == 0)
            s = (i + i/9 - 1)*times;
        else
            s = (i + i/9)*times;
    }
    return s;
}
int main(void) {
    int T,m,k;
    scanf("%d",&T);
    while(T--) {
        scanf("%d %d",&m,&k);
        printf("%d\n",solve(m,k));
    }
    return 0;
}