#include <iostream>
using namespace std;
int main()
{
int N, F;
cin >> N >> F;
N-=N%100;
temp=N;
for (int i=0; i<100; i++)
{
N=temp+i;
if(N%F==0)
{
if(i<10)
{
cout << 0 << i;
break;
}
else
{
cout << i;
break;
}
}
}
return 0;
}
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