#include<fstream>
#include<bitset>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
bitset <2000000002> a;
int main()
{
    bool n, i, k;
    fin>>n;
    for(i=1; i<=n; i++)
    {
        fin>>a[i];
    }

    for(i=1; i<=n; i++)
    {
        if(a[i]<a[i+1])
            k++;
        else if(a[i]>a[i+1])
            i++;
    }
    fout<<k;
    fin.close();
    fout.close();
    return 0;
}