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#include<stdio.h>
int main()
{
  int n;
  scanf("%d",&n);
  int arr[n][3];
  int count = 0;
  int c = 0;
  for(int i = 0;i<n;i++)//ekhane tui index 1 theke n porjonto jaccis kintu array er index kokhhono n hoi?naki 0 theke n-1 porjonto hoi
  {
    for(int j = 0;j<3;j++)
    {
      scanf("%d",&arr[i][j]);
    }
  }
  for(int i = 0;i<n;i++)
  {
    c = 0;
    for(int j = 0;j<3;j++)
    {
       c = c+arr[i][j];
    }
    if(c>=2)count++;
  }

  printf("%d\n",count);
}