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;
 
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()
int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n,a,b;
    cin>>n>>a>>b;
    ll l[n+5],r[n+5];
    ll g=a/gcd((b+1)%a,a),MX=1e18+1;
    if(MX/b<=a){
        g=a*b;
    }
    else{
        g=MX;
    }
    for(ll i=1;i<=n;i++){
        cin>>l[i]>>r[i];
    }
    if(n==1){
        cout<<min(r[1]-l[1]+1,g);
    }
}
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