n=Scanf_Int();
for (int i=1;i<=n;i++){
l=Scanf_Int();
r=Scanf_Int();
h[i]=l*100000+r;
}
h[0]=-1;//要设置,反正不能为0
for (int i=1;i<=n;i++){
m2=1;
while (h[i]==h[i-1]&&i<=n){
i++;
m2++;
}
max=Math.max(max,m2);
}
out.println(max);
out.close();