a=[0,0,0,0,0]
minSum=minn=10001
N=int(input())
for i in range (5):
    a[i]=int(input())
for i in range (N-5):
    if (a[0]<minn):
        minn=a[0]
    elem=int(input())
    if((elem**2+minn**2)<minSum):
        minSum=elem**2+minn**2
    for j in range (4):
        a[j]=a[j+1]
    a[4]=elem
print (minSum)