/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author
 */

#include <iostream>
#include <fstream>

#ifndef SOLUTION_COMMON_H

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using PI = pair<int, int>;
template<class T> using V = vector<T>;
using VI = V<int>;
#define _1 first
#define _2 second

#ifdef MY_DEBUG
# define DEBUG(x) x
#else
# define DEBUG(x)
#endif

template<class T>
inline void debug(T &A) {
  DEBUG(
      for (const auto &a : A) {
        cerr << a << " ";
      }
      cerr << '\n';
  )
}

template<class T, class Func>
inline void debug_with_format(T &A, Func f) {
  DEBUG(
      for (const auto &a : A) {
        cerr << f(a) << " ";
      }
      cerr << '\n';
  )
}

template<class T>
inline void debug_dim2(T &A) {
  DEBUG(
      for (const auto &as : A) {
        debug(as);
      }
  )
}

template<typename ... Args>
inline void debug(const char *format, Args const &... args) {
  DEBUG(
      fprintf(stderr, format, args ...);
      cerr << '\n';
  )
}

template<typename ... Args>
string format(const string &fmt, Args ... args) {
  size_t len = snprintf(nullptr, 0, fmt.c_str(), args ...);
  vector<char> buf(len + 1);
  snprintf(&buf[0], len + 1, fmt.c_str(), args ...);
  return string(&buf[0], &buf[0] + len);
}

template<class T1, class T2>
string fmtP(pair<T1, T2> a) {
  stringstream ss;
  ss << "(" << a._1 << "," << a._2 << ")";
  return ss.str();
}

#define SOLUTION_COMMON_H

#endif //SOLUTION_COMMON_H

const int MOD = 1000000007;

class C {
public:
  void solve(std::istream& in, std::ostream& out) {
    int n;
    string s;
    in >> n >> s;
    VI l(n), r(n);
    for (int i = 0; i < n; ++i) {
      if (i > 0) l[i] = i - 1;
      if (i < n - 1) r[i] = i + 1;
    }
    l[0] = -1;
    r[n - 1] = -1;

    int ans = 0;
    int i = 0;
    while(i != -1) {
      if (s[i] == '3' || s[i] == '5' || s[i] == '7') {
        ans++;
        int R = r[i];
        int L = l[i];
        debug("* %d %d %d", i, R, L);
        if (R != -1) l[R] = L;
        if (L != -1) r[L] = R;
        i = L != -1 ? L : R;
        continue;
      }

      // 11 | 19
      if ((s[i] == '1' && l[i] != -1 && s[l[i]] == '1') ||
          (s[i] == '9' && l[i] != -1 && s[l[i]] == '1')
      ) {
        ans++;
        int R = r[i];
        int L = l[l[i]];
        debug("** %d %d %d", i, R, L);
        if (R != -1) l[R] = L;
        if (L != -1) r[L] = R;
        i = L != -1 ? L : R;
        continue;
      }
      i = r[i];
    }

    out << ans;
  }
};


int main() {
	C solver;
	std::istream& in(std::cin);
	std::ostream& out(std::cout);
	solver.solve(in, out);
	return 0;
}