#!/usr/bin/env pypy3

MAX_N = 5 * 10 ** 6


def main():
    n, m = (int(x) for x in input().split())
    fibs = [0] * (MAX_N + 2)
    fibs[1] = 0
    fibs[2] = 1
    for i in range(3, MAX_N + 1):
        fibs[i] = (fibs[i - 1] + fibs[i - 2]) % m
    print(fibs[n])


if __name__ == '__main__':
    main()