#include<bits/stdc++.h>
using namespace std;
 
const int MaxN=2e5;
const int MaxA=1e9;
int N, M;
int A[MaxN];
int B[MaxN];
 
int main(){
	cin>>N>>M;
	for(int n=0; n<N; n+=1)
		cin>>A[n];
	for(int m=0; m<M; m+=1){
		cin>>B[m];
		B[m]+=1;
	}
 
	// 由小到大枚舉對變化量有影響的價格
	sort(A,A+N);
	sort(B,B+M);
	int n=0; //#seller
	int m=M; //#buyer
	int a=0, b=0;
	while( m>n ){
		int x=(b==M || a<N && A[a]<=B[b] )? A[a]:B[b];
		for( ; a<N && A[a]==x; a+=1)
			n+=1;
		for( ; b<M && B[b]==x; b+=1)
			m-=1;
		if( m<=n ){
			cout<<x;
			return 0;
		}
	}
}

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MyA0CjExMCA5MCAxMjAKMTAwIDgwIDEyMCAxMDAwMAo=

3 4
110 90 120
100 80 120 10000