This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*
ID: didarco1
TASK:
LANG: c++17
*/
#include "bits/stdc++.h"
#define ll long long int
#define pb push_back
#define pii pair<ll,ll>
#define ff first
#define ss second
#define sz size()
const int N = 2e5 + 1;
using namespace std;
ll n, a, b;
set <pii> s;
int main(){
cin >> n >> a >> b;
for(int i = 1; i <= n; i++){
ll x, y;
cin >> x >> y;
for(int j = x; j <= y; j++){
ll san = j + j/b;
san %= a;
int san1 = j % b;
s.insert({san,san1});
}
}
cout << (int)s.sz;
}
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