//No.2547 Did you enjoy Chofu Festival?
#include <stdio.h>

int main(void){
    
    int N;
    scanf("%d", &N);
    int a[N], b[N];
    for(int i=0; i<N; i++){
        scanf("%d ", &a[i]);
    }
    for(int i=0; i<N; i++){
        scanf("%d ", &b[i]);
    }

    int cnt = 0;
    for(int i=0; i<N; i++){
        if(b[i] >= a[i]){
            cnt++;
        }
    }

    printf("%d\n", cnt);

    return 0;
}