#include<stdio.h>
int N;
int date[14]={0,31,59,90,120,151,181,212,243,273,304,334,};
int T[400], D[400];
int df(int x,int y){return date[x-1]+y;}
int ans;
int input(){
scanf("%d",&N);
int a,b,c,d;
for(int i=0;i<400;i++)T[i] = 1000;
for(int i=0;i<N;i++){
scanf("%d %d %d %d",&a,&b,&c,&d);
if(T[df(c,d)]>df(a,b))T[df(c,d)]=df(a,b);
}
return 0;
}
int solve(){
for(int i=0;i<400;i++)D[i] = 1000;
for(int i=0;i<df(3,1);++i)D[i] = 0;
for(int i=df(3,1);i<=df(11,30);++i)for(int j=T[i]-1;j<i;j++)if(D[i] < D[j] + 1)D[i] = D[j] + 1;
ans = (D[df(11,30)] == 1000 ? 0 : D[df(11,30)]);
return 0;
}
int output(){
printf("%d",ans);
return 0;
}
int main(){
input();
solve();
output();
return 0;
}
