import sys
input = sys.stdin.readline

import math

def main():
    n = int(input())
    ans = n
    j = 1
    while True:
        i = math.floor(n ** (1/j))
        k = n - i ** j
        if k < 0:
            i -= 1
            k = n - i ** j
        ans = min(ans, i+j+k)
        j += 1
        #print(i,j,k)
        if i == 1:
            break
    print(ans)


if __name__ == "__main__":
    main()