import std;

void main () {
    int N = readln.chomp.to!int;
    int M1 = readln.chomp.to!int;
    int[] A = readln.split.to!(int[]);
    int M2 = readln.chomp.to!int;
    int[] B = readln.split.to!(int[]);

    solve(N, M1, A, M2, B);
}

void solve (int N, int M1, int[] A, int M2, int[] B) {
    int[] arr = new int[](N+1);

    // 1 -> 汚れ | 0 -> 汚れてない
    int sum = 0;
    arr[sum] = 1;
    foreach (a; A) {
        sum += a;
        arr[sum] = 1;
    }

    foreach (b; B) {
        sum -= b;
        arr[sum] = 1;
    }

    int ans = 0;
    foreach (a; arr) {
        if (a == 0) {
            ans++;
        }
    }

    writeln(ans);
}