#include <iostream>
using namespace std;
int main() {
int n,a,b,c,k=0;
cin>>n;
for (int i=10;i<=99;i++) {
c=i*n;
a=i/10+i%10;
b=(c/10)%10+c%10+c/100;
if (a==b) k++;
}
cout<<k;
return 0;
}
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