N, M = list(map(int, input().split()))

F = [None for _ in range(N)]
F[0:1] = [0,1]

for i in range(2,N):
    temp = F[i-1] + F[i-2]
    if temp == 0:
        print(0)
        break
    elif temp >= M:
        F[i] = temp - M
    else:
        F[i] = temp
else:
    print(F[N-1])