#include <bits/stdc++.h>
using namespace std;
int main() {
int n, a, b, c, r = 601;
scanf("%d", &n);
while(n--) {
scanf("%d %d %d", &a, &b, &c);
if(a + b + c >= 512)
r = min(r, a + b + c);
}
printf("%d", r == 601 ? -1 : r);
return 0;
}
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