#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
const ll mod = 1e9 + 7;
const ll INF = 1e18;
//--------------------------------------------------------------------
ll n, A, B;
map<pa, bool> mp;
ll a[10000];
void hbmt() {
cin >> n >> A >> B;
ll cnt = 0;
// if(n == 1) {
// ll l, r;
// cin >> l >> r;
// ll bcnn = A*B / __gcd(A, B);
// }
ll res = A * (B + 1) / __gcd(A, B + 1);
res = res / (B + 1) * B;
FOR(i, 1, n) {
ll l, r;
cin >> l >> r;
ll x = l % res, y = r % res;
// cout << x << ' ' << y << ' ' << res << '\n';
if(r - l + 1 >= res) {
cout << res;
return;
}
if(x <= y) {
FOR(j, x, y) a[j] = 1;
}
else {
FOR(j, 0, y) a[j] = 1;
FOR(j, x, res - 1) a[j] = 1;
}
}
FOR(i, 0, res - 1) cnt += a[i];
cout << cnt;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
#define NAME "hbmt"
if(fopen(NAME".inp", "r")) {
freopen(NAME".inp", "r", stdin);
freopen(NAME".out", "w", stdout);
}
//int t;cin>>t;while(t--)
hbmt();
return 0;
}
Compilation message (stderr)
strange_device.cpp: In function 'int main()':
strange_device.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
57 | freopen(NAME".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
58 | freopen(NAME".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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