import sys from operator import itemgetter from collections import defaultdict, deque import heapq import bisect import math import itertools from decimal import Decimal stdin=sys.stdin sys.setrecursionlimit(10 ** 8) ip=lambda: int(sp()) fp=lambda: float(sp()) lp=lambda:list(map(int,stdin.readline().split())) sp=lambda:stdin.readline().rstrip() Yp=lambda:print('Yes') Np=lambda:print('No') inf = 1 << 60 inf1 = float('inf') mod = 10 ** 9 + 7 mod = 998244353 eps = 1e-9 sortkey1 = itemgetter(0) sortkey2 = lambda x: (x[0], x[1]) ############################################################### decimal.getcontext().prec=20 N = ip() def f(x): t = math.sqrt(x) ok = t - 1; ng = t + 1 for _ in range(50): mid = (ok + ng) / 2 if mid > t: ng = mid else: ok = mid return ok ans = 0 for _ in range(N): x = ip() ans += f(x) print(ans)