#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i64 = long long;
using m32 = atcoder::static_modint<998244353>;
#define rep(i,n) for(int i=0; i<(int)(n); i++)


int main(){
    int N; cin >> N;
    vector<int> R(N);
    rep(i,N) cin >> R[i];
    rep(i,N-1) R[i+1] = max(R[i], R[i+1]);
    int p = 1;
    int ans = 0;
    while(p != N){
        ans++;
        p = R[p-1];
    }
    cout << ans << endl;
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;