#include<stdio.h>
int main()
{
int A, B, D, num, last = 0, i;
int a[1001];
scanf("%d%d%d", &A, &B, &D);
num = A + B;
if(num == 0)
{
printf("0");
return 0;
}
while(num)
{
a[last] = num % D;
num = num / D;
last ++;
}
for(i=last-1;i>=0;i--)
{
printf("%d", a[i]);
}
return 0;
}
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