南阳56

 #include<stdio.h>

int main()
{
    int n,m,s,t;
    while(~scanf("%d",&t))
    {
        while(t--)
        {
            scanf("%d%d",&n,&m);
            s=0;
            while(n>=m)
            {
                s+=n/m;
                n/=m;
            }
            printf("%d
",s);
        }
    }
}