#include<iostream>
#define N 50000
using namespace std;
int main()
{
int n, a[N], sum = 0;
cin >> n;
for (int i = 0; i < n; i++)
cin >> a[i];//输入数据
for (int i = 0; i < n; i++)
{ int min=a[i], max=a[i];
for (int j = i; j < n; j++)
{
if (a[j] > max)
max = a[j];
if (a[j] < min)
min = a[j];
if (i == j) sum++;
else
{
if (max-min== j-i)
sum++;
}
}
}
cout << sum;
return 0;
}