Submission #2235926

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Source Code Expand

#include<bits/stdc++.h>

#ifdef LOCAL
#include "../dump.hpp"
#else
#define dump(...)
#endif

using namespace std;

#define rep(i,n) for(int i=0,i##_len=(n);i<i##_len;i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ROF(i,a,b) for(int i=(a)-1;i>=(b);i--)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend() //sortで大きい順
#define UNIQUE(v) v.erase(unique(all(v)),v.end())
#define SUM(a) accumulate(all(a),0)
#define pb push_back
#define fst first
#define snd second
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;
typedef pair<int,int> pii;
typedef long long ll;

int main(){
  int n; cin >> n;
  vi p(n); rep(i,n) cin >> p[i];

  int c = 0;
  rep(i,n){
    if(p[i] == i+1){
      c++;
      i++;
    }
  }
  cout << c << endl;
}

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