import math

# p=[1, 1, 1, 1, 1, 1, 1, 1, 1]

numofstone = raw_input()
p = map(int,raw_input().split())

for i in xrange(100):
    p.append(0)

s = sum(p)
# print s

r = math.sqrt(s)

delete = 0

if r==int(r):
    r=int(r)
else:
    for i in xrange(1,1000):
        s-=1
        r = math.sqrt(s)
        if r==int(r):
            delete=i
            r=int(r)
            break

# print r
# print "delete",delete


# print r
# print

ans=0

if delete==0:
    n=-1
    for i in xrange(1,r+1):
        n+=1
        sa=abs(p[n]-i)
        # print i, sa
        ans+=sa

    for i in xrange(r-1,0,-1):
        n+=1
        sa=abs(p[n]-i)
        # print i,sa
        ans+=sa

    for i in xrange(2*r-1,len(p)):
        n+=1
        sa=p[n]
        # print 0,sa
        ans+=sa

else:
    n=-1
    for i in xrange(1,r+1):
        n+=1
        sa=p[n]-i
        # print i, sa
        if sa<0:
            ans+=sa

    for i in xrange(r-1,0,-1):
        n+=1
        sa=abs(p[n]-i)
        # print i,sa
        if sa<0:
            ans+=sa

    for i in xrange(2*r-1,len(p)):
        n+=1
        sa=p[n]
        # print 0,sa
        if sa<0:
            ans+=sa

if delete>0:
    print ans+delete
else:
    print ans/2