#include <iostream>
using namespace std;
int main(){
int n, a , b , C = 0, x, sx , y , sy;
cin >> n >> a;
for(int i = 2 ; i <= n ; ++i){
cin >> b;
x = a; y = b;
sx = sy = 0;
while(x)
sx += x % 10, x /= 10;
while(y)
sy += y % 10, y /= 10;
if(sx%2 != sy%2)
C++;
a = b;
}
cout << C;
return 0;
}
