N = int(input())
try:
    A = []
    for i in range(3):
        A.append(int(input()))
    B = [A[0] + A[1], A[1] + A[2], A[2] + A[0]]
    B = sorted(B)
    if B[1] == B[2]:
        print(B[0])
    else:
        print(B[1])
except:
    print('\"assert\"')