CODE
#include <iostream>
using namespace std;
int main(){
int n,m;
cin >> n >> m;
int A[n][m];
int counter = 0;
int sum;
int digit_c = 0;
int K, R;
for (int k = 0; k < n; ++k) {
for (int i = 0; i < m; ++i) {
cin >> A[k][i];
}
}
cin >> K >> R;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < m; ++j) {
sum = 0;
digit_c = 0;
int c = A[i][j];
while( c > 0 ){
sum = sum + c % 10;
digit_c++;
c /= 10;
}
if( digit_c == K && sum % R == 0 ){
counter++;
}
}
}
cout << counter;
}