#include <iostream>

int main() {
    int cube[2][3][4] = {
        {
            {1, 2, 3, 4},
            {5, 6, 7, 8},
            {9, 10, 11, 12}
        },
        {
            {13, 14, 15, 16},
            {17, 18, 19, 20},
            {21, 22, 23, 24}
        }
    };
    
    int k = 2;
    int layerSum = 0;
    
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            layerSum += cube[i][j][k];
        }
    }
    
    std::cout << "Sum of layer " << k << ": " << layerSum << std::endl;
    
    return 0;
}