#include<cstdio>
#include<math.h>
int main() {
	char a[1000], b[1000];
	int c, d = 0, e = 0;
	scanf("%d", &c);
	for (int i = 0; i <= c - 1; i++) {
		scanf("%c", &a[i]);
	}
	for (int i = 0; i <= c - 1; i++) {
		scanf("%c", &b[i]);
	}
	for (int i = 0; i <= c - 1; i++) {
		if (a[i] == '1') {
			d++;}
	}
	for (int i = 0; i <= c - 1; i++) {
		if (b[i] == '1') {
			e++;}	
	}
	if(d==0&&e==0)
	printf("0");
	else if((d==0||e==0)&&(!(d==0&&e==0)))
printf("%d",d!=0?d:e);
	else printf("%d", abs(d - e));
	return 0;
}