#include <cstdio>
int main(){
    int N,M;
    scanf("%d %d",&N,&M);
    int A[1000];
    int Ai;
    int Bj;
    int count[1000];
    for(int i=0;i<N;i++){
        scanf("%d",&Ai);
        A[i]=Ai;
        count[i]=0;
    }
    for(int j=0;j<M;j++){
        scanf("%d",&Bj);
        for(int i=0;i<N;i++){
            if(A[i]<=Bj){count[i]++;break;}
        }
    }
    int max_count=0;
    int max_game=-1;
    for(int i=0;i<N;i++){
        if(max_count<count[i]){
            max_count=count[i];
            max_game=i;
        }
    }
 
    printf("%d\r\n",max_game+1);
}

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3
1
4
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5
9
2
6
5
3
5
9