def main():
    x = int(input())
    comp = []
    
    while x % 2 == 0:
        comp.append(2)
        x /= 2
    odd = 3
    while odd ** 2 <= x:
        while x % odd == 0:
            comp.append(odd)
            x /= odd
        odd += 2
    if x != 1:
        comp.append(x)
    
    y = 1
    loop_flg = True
    while len(comp) >= 1:
        num = comp.pop(0)
        if num == comp[0]:
            del comp[0]
        else:
            y *= num
    if len(comp) == 1:
        y *= comp[0]
    else:
        pass
                    
    
    print(y)
    
    
if __name__ == '__main__':
    main()