#include<bits/stdc++.h>
using namespace std;
bool open[5000];
int main()
{
    for(int i = 1; i <= 2020; i++)open[i] = true;
    for(int i = 1; i <= 2020; i++)
    {
        if(i % 3)open[i] = !open[i];
    }
    for(int i = 1; i <= 2020; i++)
    {
        if(i % 5)open[i] = !open[i];
    }
    for(int i = 1; i <= 2020; i++)
    {
        if(i % 6)open[i] = !open[i];
    }
    int cnt = 0;
    for(int i = 1; i <= 2020; i++)
    {
        if(open[i])cnt++;
    }
    cout << cnt;
	return 0;
}

各位大佬帮忙看下为啥RE