import sys
input = sys.stdin.readline

from math import gcd

N,B=map(int,input().split())

if B==1:
    print(0)
    exit()

if N==0:
    print("NaN")
    exit()

if N==1:
    print(1)
    exit()

if gcd(N,B)!=1:
    print("NaN")
else:
    print(pow(N,-1,B))