void multiplySixLoops(int r) {
	for (int i = 0; i < size; i += r) {
		for (int j = 0; j < size; j += r) {
			for (int k = 0; k < size; k += r) {
#pragma omp parallel for
				for (int ii = i; ii < i + r; ii++) {
					for (int kk = k; kk < k + r; kk++) {
						for (int jj = j; jj < j + r; jj++) {
							matrix6s[ii][jj] += matrixa[ii][kk] * matrixb[kk][jj];
						}
					}
				}
			}
		}
	}
}