#include<stdio.h>
int main()
{
    int x[50000];
    int a,b;
    scanf("%d",&a);
    for(int i=0;i<a;i++)
    {
            scanf("%d",&x[i]);
    }
    for(int i=0;i<a;i++)
    {
        if(x[i]%2==0)
        {
            if(x[i+1]%2==1)
            {
                b++;
            }
        }
    }
    printf("%d",b);
}

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