#include <iostream>
using namespace std;
int c[1000000];
int main() {
int a,b,sum=0,max=-1,count=0,s=0;
cin>>a>>b;
for (int i=0;i<a;i++){
cin>>sum>>max>>c[i];
if (i==1||i==2){
count+=c[i];}
}
cout<<count<<endl;
return 0;
}
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