#include<bits/stdc++.h>//只会暴力 
using namespace std;
int n,mi=0x3fffffff,a[305],b[305],c[305];
void check(int x,int y){
	int ma=0;
	for(int i=1;i<=n;i++){
		if(a[i]<=x||b[i]<=y);
		else ma=max(ma,c[i]);
	}
	mi=min(ma+x+y,mi);
}
int main()
{
	freopen("playwithboss.in","r",stdin);
	freopen("playwithboss.out","w",stdout);
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%d%d%d",&a[i],&b[i],&c[i]);
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			check(a[i],b[j]);
		}
	}
	cout<<mi;
	return 0;
}