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OI-codes/Luogu/P1161/P1161.cpp

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