str1 = input()
str2 = input()
if ' ' in str2:
    print('assert')
else:
    str3 = input()
    str4 = input()
    int2 = int(str2)
    int3 = int(str3)
    int4 = int(str4)
    intList = [int2, int3, int4]
    intList.sort()
    answer = intList[0] + intList[2]
    print(answer)