#include <bits/stdc++.h>

#define F(i, a, b) for (int i = a; i <= b; i ++)
#define G(i, a, b) for (int i = a; i >= b; i --)
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))
#define mx(a, b) ((a) = max(a, b))
#define mn(a, b) ((a) = min(a, b))
#define get getchar()
#define putc putchar
#define outarr(a, L, R) { printf(#a"[%d..%d]", L, R); F(i, L, R) W(a[i]), putc(' ') ; putc('\n'); }
#define out1(x) { printf(#x" = "), W(x), putc('\n'); }
#define out2(x, y) { printf(#x" = "), W(x), printf(" "#y" = "), W(y), putc('\n'); }
#define out3(x, y, z) { printf(#x" = "), W(x), printf(" "#y" = "), W(y), printf(" "#z" = "), W(z), putc('\n'); }

using namespace std;

template <typename Int>
void R(Int &x) {
	char c = get; x = 0; Int t = 1;
	for (; !isdigit(c); c = get) t = (c == '-' ? -1 : t);
	for (; isdigit(c); x = (x << 3) + (x << 1) + c - '0', c = get); x *= t;
}
template <typename Int>
void W(Int x) {
	if (x < 0) { putc('-'); x = - x; }
	if (x > 9) W(x / 10); putc(x % 10 + '0');
}

#define pb push_back
#define ll long long

const int N = 1e5 + 10;
char s1[N], s2[N];
int n;

int main() {
//     freopen("data.in","r",stdin);

    R(n);
    scanf("%s", s1 + 1);
    scanf("%s", s2 + 1);

	G(i, n, 1) {
		if (i == 1) {
			if (s1[i] == '1' || s2[i] == '1')
				puts("1");
			else
				puts("0");
			return 0;
		}
		if (s1[i] == '1' || s2[i] == '1')
			continue;
		puts("0");
		return 0;
	}
	
}