int L = 4;
int M = 5;
int N = 6;
\input double A[L][M];
\input double B[M][N];
double C[L][N];

void spec() {
  for (int i = 0; i < L; i++) 
    for (int j = 0; j < N; j++) {
      C[i][j] = 0.0;
      for (int k = 0; k < M; k++)
        C[i][j] += A[i][k] * B[k][j]; 
    }
}

void main() {
  spec();

}