#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>

#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 1<<30
#define pb push_back
#define mp make_pair

using namespace std;
typedef long long ll;
typedef pair<int,int> P;

int main() {

    vector<int> n(1000),k(1000);
    rep(i,1000) cin >> n[i] >> k[i];

    if((n[0]-1)%(k[0]+1) == 0) {
        cout << 0 << endl;
    } else cout << 1000 << endl;

    return 0;
}