#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include<bits/stdc++.h>
#include<math.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
typedef pair<ll, ll> pl;
#define K first
#define V second
#define G(x) ll x; cin >> x;
#define GD(x) ld x; cin >> x;
#define GS(s) string s; cin >> s;
#define EX(x) { cout << x << '\n'; exit(0); }
#define A(a) (a).begin(), (a).end()
#define F(i, l, r) for (ll i = (l); i < r; ++i)
#define NN
#define M 1000000007 // 998244353
int main(){
// freopen("a.in", "r", stdin);
// freopen("a.out", "w", stdout);
ios_base::sync_with_stdio(false); cin.tie(0);
cout << fixed << setprecision(20);
G(h) G(v)
vector<ll> y(v);
vector<ll> x(h);
for (auto &y: x) cin >> y;
for (auto &x: y) cin >> x;
sort(A(x)); sort(A(y));
unordered_map<ll, ll> cnt;
F(i, 0, v) F(j, i+1, v) cnt[y[j]-y[i]]++;
ll ans = 0;
F(i, 0, h) F(j, i+1, h) ans += cnt[x[j]-x[i]];
cout << ans << '\n';
}
