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 <bits/stdc++.h>
using namespace std;
const long long INF = 2e18;
int main() {
cin.tie(nullptr)->sync_with_stdio(false);
int N;
long long A, B;
cin >> N >> A >> B;
long long M = INF / A >= B ? A * B : INF;
vector<long long> rem;
for (int i = 0; i < N; i++) {
long long L, R;
cin >> L >> R;
for (auto i = L; i <= R; i++) {
rem.push_back(i % M);
}
}
sort(rem.begin(), rem.end());
cout << (unique(rem.begin(), rem.end()) - rem.begin()) << "\n";
}
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