This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
const int MAXN = 1007;
int n, ans = 0;
int a[MAXN], b[MAXN];
void rec(int ind, int temp){
	if(ind == n) 
		ans += (temp*temp*temp*temp + 2*temp*temp) % 5 + 1;
	for(int i = a[ind]; i <= b[ind]; i++)
		rec(ind+1, temp+i);
}
int main()
{
	cin >> n;
	for(int i = 0; i < n; i++)
		cin >> a[i] >> b[i];
	rec(0, 0);
	cout << ans << endl;
}
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