#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]; ll ans=LINF;
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];
if(n<=20){
for(int mask = 0; mask < (1<<n); mask++){
int num = __builtin_popcount(mask);
if(num<A or num>B or !(mask&(1<<(n-1)))) continue;
ll Or = 0, sum = 0;
for(int i = 0; i < n; i++){
if(mask&(1<<i)) sum+=a[i], Or|=sum, sum=0;
else sum+=a[i];
}
ans = min(ans, Or);
}
}
else if(n<=50){
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][B+1][k]) ans = min(ans, (ll)k);
}
else{
int dp[n+1][2050];
for(int i = 0; i <= n; i++)
fill(dp[i], dp[i]+2050, n+1);
dp[0][0]=0;
for(int i = 0; i < n; i++){
for(int j = 0; j < 2048; j++){
for(int k = i+1; k <= n; k++){
if(dp[i][j]!=n+1) dp[k][j|(pre[k]-pre[i])]=min(dp[k][j|(pre[k]-pre[i])], dp[i][j]+1);
}
}
}
for(int j = 0; j < 2048; j++)
if(dp[n][j]<=B) ans=min(ans,(ll)j);
}
cout << ans;
}
