#include <iostream>
using namespace std;
int main() {
int a, b, d;
cin >> a >> b >> d;
int t = a + b;
if(t ==
0) {
cout <<
0;
return 0;
}
int s[
100];
int i =
0;
while(t !=
0) {
s[i++] = t % d;
t = t / d;
}
for (
int j = i -
1; j >=
0; j--) {
cout << s[j];
}
return 0;
}
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