#include<cstdio>
int main(int argc,char **argv){
    int num,ans=0;
    char str[4];
    scanf("%d",&num);
    while(num--){
        scanf("%s",str);
        if(((str[3]-'0')-(str[2]+str[1]+str[0]-'0'*3))>0){
            ans++;
        };
    };
    printf("%d",ans);
    return 0;
};