import sys
input = lambda :sys.stdin.readline()[:-1]

from math import sqrt, pi, exp, log, log10, sin, cos, tan, ceil, floor, perm, comb, gcd, modf, prod, inf, nan

def main():
    L, R = map(int, input().split())

    ans = 0

    for i in range(R-L):
        ans = gcd((R+i) ** (R+i), (R+i+1) ** (R+i+1))

    print(ans)

if __name__ == '__main__':
    main()