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21 lines
348 B
C++
21 lines
348 B
C++
// R36448353
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n, t, ans;
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n = t = ans = 0;
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double a;
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n = t = ans = 0;
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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++) {
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ans ^= int(j * a);
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}
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}
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cout << ans << endl;
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return 0;
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} |