#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll l,r,c,ans = INF;
    cin >> l >> r >> c;
    c %= 1000;
    vector<bool> x(1000,false);
    for(ll i=l;i<=r;i++){
        if(x[(i*c)%1000]) break;
        chmin(ans, (1000-(i*c)%1000)%1000);
        x[(i*c)%1000] = true;
    }
    cout << ans << '\n';
    return 0;
}