import sys
input = sys.stdin.readline

import math

def main():
    n = int(input())
    ans = n
    j = 1
    while True:
        i = solve(j,n)
        k = n - pow(i, j)
        ans = min(ans, i+j+k)
        j += 1
        #print(i,j,k)
        if i == 1:
            break
    print(ans)

def solve(j,n):
    #i ** j <= nとなる最大のi
    ok = 0
    ng = pow(10,18)
    while abs(ok - ng) > 1:
        mid = (ok+ng)//2
        if pow(mid, j) <= n:
            ok = mid
        else:
            ng = mid
    return ok


if __name__ == "__main__":
    main()