import math


def main():
    ans = 10 ** 13
    x = int(input())
    for i in range(1, int(math.sqrt(x)) + 1):
        if x % i == 0 and x // i % i == 0:
            ans = min(ans, x // i // i)
    print(ans)
    
    
if __name__ == '__main__':
    main()