#int(input())
#map(int, input().split())
#list(map(int, input().split()))

T = int(input())

n = [0] * T
m = [0] * T
for i in range(T):
    n[i], m[i] = input().split()

ans = []
for i in range(T):
    N = n[i][::-1]
    M = int(m[i])
    M *= 2

    p = 1

    a = 0
    for j in range(len(N)):
        a = (a + p*int(N[j])) % M
        p = (p * 10) % M

    ans.append((a*(a+1)//2) % (M // 2))

for x in ans:
    print(x)