#include<stdio.h>
int main()
{
    int n,x,y=0,i,sum=0,j,k,l;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d %d %d",&j,&k,&l);
        sum=sum+j+k+l;
        if(sum>=2)
        {
         x=1;
         y=y+x;
        }
        else
        {
            continue;
        }
    }
    printf("%d",y);
    return 0;
}