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OI-codes/problem/P1161/P1161.cpp

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2020-08-05 17:55:51 +00:00
// R36448353
#include<bits/stdc++.h>
using namespace std;
int main() {
int n, t, ans;
n = t = ans = 0;
double a;
n = t = ans = 0;
cin >> n;
for(int i = 1 ; i <= n ; i++) {
cin >> a >> t;
for(int j = 1 ; j <= t ; j++) {
ans ^= int(j*a);
}
}
cout << ans << endl;
return 0;
}