N = int(input())
a0 = input()
if len(a0) > 1 :
    print('"assert"')
else :
    a0 = int(a0)
    a1 = int(input())
    a2 = int(input())
    
    A = [a0,a1,a2]

    B = []
    for i in range(2) :
        for j in range(i+1,3) :
            B.append(x+y)
    B.sort()
    print(B[-2])