#include<bits/stdc++.h>
using namespace std;
int n,a[105],b[105];
int main(){
    freopen("proposal.in","r",stdin);
    freopen("proposal.out","w",stdout);
    scanf("%d",&n);
    for (int i=1;i<=n;i++){
        scanf("%d",&a[i]);
    }
    for (int i=1;i<=n;i++){
        scanf("%d",&b[i]);
    }
    for (int i=n;i>=0;i--){
        int flag=0;
        for (int j=i,k=n;j>=1;j--,k--){
            if (a[j]>b[k]){
                flag=1;
            }
        }
        if (flag==0){
            cout<<n-i;
            return 0;
        }
    }
    return 0;
}