执行以下程序后，输出结果是（ ）

int n = 2, sum = 0;
char c = 'B';
switch (n)
{
    case 1:
        sum = 10;
        switch (c)
        {
            case 'A': sum += 10; break;
            case 'B': sum += 8; break;
            case 'C': sum += 6; break;
            default: sum += 5;
        }
        break;
    case 2:
        sum = 8;
        switch (c)
        {
            case 'A': sum += 5; break;
            case 'B':
            case 'C': sum += 1;
        }
        break;
    default:
        sum = 6;
}
cout << sum;