#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int maxn = (int)53;
const ll LINF = (ll)1e18;
int n, A, B;
ll a[maxn], pre[maxn]; int ans=1029;
bool dp[maxn][maxn][25][1028];
void recur(int pos, int lpos, int knum, int Or){
if(dp[pos][lpos][knum][Or]) return;
dp[pos][lpos][knum][Or]=1;
if(pos==n+1) return;
if(pos!=n) recur(pos+1, lpos, knum, Or);
recur(pos+1, pos, knum+1, Or|(pre[pos]-pre[lpos]));
}
int32_t main() {
cin >> n >> A >> B;
for(int i = 0; i < n; i++) cin >> a[i], pre[i+1]=pre[i]+a[i];
recur(1,0,1,0);
for(int i = A+1; i <= B+1; i++)
for(int k = 0; k < 1028; k++)
if(dp[n+1][n][i][k]) ans = min(ans, k);
cout << ans;
}
