1 #include<iostream>
 2 #include<string>
 3 #include<algorithm>
 4 
 5 using namespace std;
 6 
 7 int main() {
 8     int a = 0, b = 0;
 9     int n = 0;
10     int ary = 0;
11     string d = "";
12     cin >> a >> b >> ary;
13     n = a + b;
14     do {
15         d += to_string(n % ary);    //转化为字符串处理，方便逆序
16         n /= ary;
17     } while (n != 0);
18     reverse(d.begin(), d.end());    //逆序
19     cout << d;
20     return 0;
21 }