#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <stdbool.h>

static FILE *fr, *fw;

// Declaring variables
static int N;
static int* voti2;
static int* voti5;
static int res;

// Declaring functions
bool associabili(int N, int* voti2, int* voti5);

int main() {
	fr = stdin;
	fw = stdout;

	// Iterators used in for loops
	int i0;

	// Reading input
        fscanf(fr, "%d", &N);
	voti2 = (int*)malloc(N * sizeof(int));
	voti5 = (int*)malloc(N * sizeof(int));
	for (i0 = 0; i0 < N; i0++) {
            fscanf(fr, "%d", &voti2[i0]);
	}
	for (i0 = 0; i0 < N; i0++) {
            fscanf(fr, "%d", &voti5[i0]);
	}

	// Calling functions
	res = associabili(N, voti2, voti5);

	// Writing output
        fprintf(fw, "%d\n", res);
	
	fclose(fr);
	fclose(fw);
	return 0;
}