#include<bits/stdc++.h>
using namespace std;
#define N 1010
int f[N],a[N],b[N],d[N],c[N];
int main()
{
    int n;scanf("%d",&n);int ans=0;
    for(int i=1;i<=n;i++)scanf("%d%d%d",&a[i],&b[i],&c[i]),d[a[i]]+=c[i],d[b[i]+1]-=c[i];
    f[0]=0;for(int i=1;i<=N;i++)f[i]=f[i-1]+d[i],ans=max(ans,f[i]);
//  for(int i=1;i<=N;i++)printf("%d ",f[i]);puts("");
    printf("%d",ans);
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
#define N 1010
int f[N],a[N],b[N],d[N],c[N];
int main()
{
    int n;scanf("%d",&n);int ans=0;
    for(int i=1;i<=n;i++)scanf("%d%d%d",&a[i],&b[i],&c[i]),d[a[i]]+=c[i],d[b[i]+1]-=c[i];
    f[0]=0;for(int i=1;i<=N;i++)f[i]=f[i-1]+d[i],ans=max(ans,f[i]);
//  for(int i=1;i<=N;i++)printf("%d ",f[i]);puts("");
    printf("%d",ans);
    return 0;
}