#include <bits/stdc++.h>
using namespace std;
int main() {
long long a[100][100];
long long b[100];
for(int i = 1; i <= 12; ++i){
for(int j = 1; j <= 3; ++j){
cin >> a[i][j];
}
}
long long max=a[1][1];
for(int j = 1; j <= 12; ++j){
for(int i = 1; i <= 3; ++i){
if(a[j][i] > max)max = a[j][i];
}
}
cout << max;
return 0;
}
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