#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;

const int N = 202020;

inline char get(void) {
    static char buf[100000], *S = buf, *T = buf;
    if (S == T) {
        T = (S = buf) + fread(buf, 1, 100000, stdin);
        if (S == T) return EOF;
    }
    return *S++;
}
template<typename T>
inline void read(T &x) {
    static char c; x = 0; int sgn = 0;
    for (c = get(); c < '0' || c > '9'; c = get()) if (c == '-') sgn = 1;
    for (; c >= '0' && c <= '9'; c = get()) x = x * 10 + c - '0';
    if (sgn) x = -x;
}

int n;
int p[N], q[N];
int f[N], T[N];

inline bool Check(int a, int b, int c) {
    return (a < b && b < c) || (b < c && c < a) || (c < a && a < b);
}

int main() {
    read(n);
    for (int i = 1; i <= n; i++) {
        read(p[i]); q[p[i]] = i;
    }
    for (int i = n - 1; i; i--) {
        if (T[i + 1] == 0) {
            if (q[i] > q[i + 1]) {
                T[i] = 1; f[i] = i + 1;
            }
        } else {
            if (Check(q[f[i + 1]], q[i], q[i + 1])) {
                T[i] = T[i + 1]; f[i] = f[i + 1];
            } else {
                T[i] = T[i + 1] + 1; f[i] = i + 1;
            }
        }
    }
    cout << T[1] << endl;
}