20分其余全wa

#include<bits/stdc++.h>
#define qwq return 0;
using namespace std;
int x,y,days,extra,sum=0;
int main(){
	cin>>x>>y;
	for(int i=x;i<=y;i++){
		days=0;
		for(int j=1900;j<=i-1;j++){
			if(j%400==0||(j%100!=0&&j%4==0))days+=366;
			else days+=365;
		}
		if(i%400==0||(i%100!=0&&i%4))days+=316;
		else days+=315;
		extra=days%7;
		if(extra==5||extra==6)sum++;
	}
	cout<<sum-1;
	
	qwq;
}