程序代码：

# include <stdio.h>

int main()
{
    int i,m,n,k;
    int a[100],b[100];

    scanf ("%d", &k);
    for (i=0; i<k; i++)
    {
        scanf ("%d%d", &a[i],&b[i]);
    }
    for (i=0; i<k; i++)
    {
        int val1 = 2*a[i]%b[i];
        int val2 = 2*a[i]/b[i];

/*        if (a[i] == 0)
        {
            printf ("0\n");
            continue;
        }
        else if(a[i] < b[i])
        {
            printf ("6\n");
            continue;
        }
*/
        if (val1 == 0)
            printf ("%d\n", 3*val2);
        else
            printf ("%d\n", 3*val2+3);
    }

    return 0;
}