#include <bits/stdc++.h>
#define se second
#define fs first
#define mp make_pair
#define pb push_back
#define ll long long
#define ii pair<ll,ll>
#define ld long double
#define SZ(v) (int)v.size()
#define ALL(v) v.begin(), v.end()
#define bit(msk, i) ((msk >> i) & 1)
#define iter(id, v) for(auto id : v)
#define rep(i,m,n) for(int i=(m); i<=(n); i++)
#define reb(i,m,n) for(int i=(m); i>=(n); i--)
using namespace std;
mt19937_64 rd(chrono :: steady_clock :: now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rd); }
const int N = 2e5 + 7;
const int Mod = 1e9 + 7;
const int szBL = 320;
const ll INF = 1e18;
const int BASE = 137;
int n, Q;
ll a[N];
ll qr[N];
ll premx[N], premn[N];
void solution () {
cin >> n >> Q;
rep (i, 1, n) cin >> a[i];
ll pre = 0;
rep (i, 1, Q) {
cin >> qr[i];
pre += qr[i];
// fenmx.update (i, pre);
// fenmn.update (i, pre);
premx[i] = max(premx[i - 1], pre);
premn[i] = min(premn[i - 1], pre);
// cout << pre <<"\n";
}
// cout << fenmn.get(Q) <<" aa\n";
// return;
a[n + 1] = INF;
a[0] = -INF;
rep (i, 1, n) {
ll R; {
ll lf = a[i], rt = INF;
while (lf < rt) {
ll X = lf + rt + 1 >> 1;
int posR; {
int lf = 0, rt = Q;
while (lf < rt) {
int mid = lf + rt >> 1;
if (a[i] + premx[mid] >= X) rt = mid;
else lf = mid + 1;
}
if (a[i] + premx[rt] >= X) posR = rt;
else posR = -1;
}
if (posR == -1 || a[i + 1] + premn[posR] < X) rt = X - 1;
else lf = X;
}
R = lf;
}
ll L; {
ll lf = -INF, rt = a[i];
while (lf < rt) {
ll X = lf + rt >> 1;
int posL; {
int lf = 0, rt = Q;
while (lf < rt) {
int mid = (lf + rt) / 2;
if (a[i] + premn[mid] <= X) rt = mid;
else lf = mid + 1;
}
if (a[i] + premn[rt] <= X) posL = rt;
else posL = -1;
}
// cout << i << " "<<X << " "<<a[i] + fenmn.get(Q) <<"\n";
if (posL == -1 || a[i - 1] + premx[posL] > X) lf = X + 1;
else rt = X;
}
L = lf;
}
cout << R - L<<"\n";
}
}
#define file(name) freopen(name".inp", "r", stdin); \
freopen(name".out", "w", stdout);
int main () {
// file("c");
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
ll num_Test = 1;
// cin >> num_Test;
while(num_Test--)
solution();
}
