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>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define pb push_back
#define vl vector<ll>
#define fi first
#define se second
#define in insert
#define all(v) v.begin(), v.end()
#define bpc(x) __builtin_popcount(x)
#define endl "\n"
using namespace std;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const int sz = 4e5 + 5;
const int LG = 21;
// using namespace __gnu_pbds;
// tree <ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> rbt;
void solve(){
ll n, A, B, i, l, r, s = 0;
cin >> n >> A >> B;
ll mx = (A * B);
for(i = 1; i <= n; i++){
cin >> l >> r;
s += min((r - l + 1), mx);
}
if(B + 1 == A){
s = B;
}
cout << s << endl;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll t = 1;
// cin >> t;
while(t--){
solve();
}
}
/*
4 100
10 30
30 70
20 40
60 20
4 100
60 20
10 30
20 40
30 70
*/
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