#include <bits/stdc++.h>
#include <atcoder/segtree>

using namespace std;
using namespace atcoder;
using ll = long long;

const int INF = 1e9+1;

struct S{
    int m1;
    int m2;
};

S op1(S a, S b){
    vector<int> v(4);
    v[0] = a.m1, v[1] = a.m2, v[2] = b.m1, v[3] = b.m2;
    sort(v.begin(), v.end());
    return {v[0], v[1]};
}

S e1(){
    return {INF, INF};
}

int op2(int a, int b){
    return max(a, b);
}

int e2(){
    return -INF;
}
 
int main(){
 
    int N, x, mx;
    cin >> N;
    S mi;
    vector<int> a(N);
    vector<S> b(N);
    ll ans=0;

    for (int i=0; i<N; i++){
        cin >> x;
        a[i] = x;
        b[i] = {x, INF};
    }
    segtree<int, op2, e2> tmx(a);
    segtree<S, op1, e1> tmi(b);

    for (int i=0; i<N; i++){
        int l=i, r=N, c;
        while(r-l>1){
            c = (l+r)/2;
            mi = tmi.prod(i, c+1);
            mx = tmx.prod(i, c+1);
            if (mx <= mi.m1 + mi.m2) l=c;
            else r=c;
        }
        ans += l-i;
    }

    cout << ans << endl;

    return 0;
}