下面C++代码执行后的输出是？（ ）
int n, masks, days,cur;
n = 17, masks = 10, days = 0;
cur = 2;
while (masks != n){
if (cur == 0 || cur == 1)
masks += 7;
masks -= 1;
days += 1;
cur = (cur + 1) % 7;
}
cout << days;
5
6
7
8