/*
 /+==================================================+\
//+--------------------------------------------------+\\
|.|\\...>>>>>>> Hollwo_Pelw(ass) 's code <<<<<<<...//|.|
\\+--------------------------------------------------+//
 \+==================================================+/
*/
#include <bits/stdc++.h>
using namespace std;
// type
typedef long long ll;
typedef long double ld;
// loop
//#define For(i, l, r)        for (int i = l; i < r; i++)
//#define ForE(i, l, r)       for (int i = l; i <= r; i++)
//#define Ford(i, r, l)       for (int i = r; i > l; i--)
//#define FordE(i, r, l)      for (int i = r; i >= l; i--)
//#define Fora(i, a)          for (auto i : a)
// I/O
#define open(file, in, out) if (fopen(file in, "r")) {        \
                                freopen(file in, "r", stdin);  \
                                freopen(file out, "w", stdout); \
                            }
#define FAST_IO             std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define setpre(n)           fixed << setprecision(n)
// pair
#define F                   first
#define S                   second
#define pii                 pair<int, int>
#define pll                 pair<ll, ll>
#define pdd                 pair<ld, ld>
// vector & !!?(string)
#define eb                  emplace_back
#define pb                  push_back
#define all(a)              a.begin(), a.end()
#define rall(a)             a.rbegin(), a.rend()
#define sz(a)               a.size()
#define len(a)              a.length()
// geometry calculate
#define pi                  acos(-1.0)
#define g_sin(a)            sin(a*pi/180)
#define g_cos(a)            cos(a*pi/180)
#define g_tan(a)            tan(a*pi/180)
// set val
#define ms0(a)              memset(a,        0, sizeof(a));
#define ms1(a)              memset(a,        1, sizeof(a));
#define msn1(a)             memset(a,       -1, sizeof(a));
#define msinf(a)            memset(a, 0x3f3f3f, sizeof(a));
// constant
const int mod1 = 998244353, mod = 1e9+7;
const int MAXN = 100005, MAXM = 200010;
// code
#define int long long

int N, X, D;
map<int, vector<pii>> mp;
void Solve() {
    cin >> N >> X >> D;

    if (D == 0 && X == 0){
        cout << 1;
        return;
    }else if (D == 0){
        cout << N+1;
        return;
    }
    if (D < 0){
        D *= -1;
        X *= -1;
    }
    for (int k = 0; k <= N; k++){
        int s = k * (k - 1) / 2;
        int t = (N - k) * k + s;
        mp[(k*X)%D].eb(((k*X)/D) + s, ((k*X)/D) + t);
    }
    int ans = 0;
    for (auto P:mp){
        vector<pii> A = P.S;
        sort(all(A));
        int l, r, f = 0;
        for (auto &p : A) {
            if (!f) {
                f = 1, l = p.F, r = p.S;
            } else {
                if (p.F <= r) {
                    r = max(r, p.S);
                }else {
                    ans += r - l + 1;
                    l = p.F;
                    r = p.S;
                }
            }
        }
        ans += r - l + 1;
    }
    cout << ans;
}

signed main(){
    open("", ".inp", ".out");
    FAST_IO;
    int TC = 1;
    //cin >> TC;
    while(TC--) Solve();
    return 0;
}
/*

./-=====>>><<<-------- DEBUG -------->>><<<=====-\.
/.................................................\

+====================== INP ======================+


+====================== OUT ======================+


\................................................./
.\-=====>>><<<--------= END =-------->>><<<=====-/.
*/


Measured memory_bytes: 25464