def dHex():
    input = map(int, raw_input().split(' '))
    number = input[0] + input [1]
    d = input[2]
    result = []
    while number >= d:
        result.append(number % d)
        number = number / d
    result.append(number % d)
    resultNum = ''
    i = len(result) - 1
    while i > -1:
        resultNum = resultNum + str(result[i])
        i -= 1
    print resultNum

if __name__ == '__main__':
    dHex()