def hash(string):
    chunks = []
    for i in range(0, len(string), 3):
        tmp = ""
        for j in range(i, i + 3):
            try:
                tmp += string[j]
            except:
                break
        chunks.append(tmp)

    chunks = map(int, chunks) 

    print(sum(chunks) % 50)


inp = input("input a number: ")        
if (len(inp) <= 10):
    hash(inp)
else:
    print("string is too long")