#include <bits/stdc++.h>
using namespace std;
int main() {
  int r, g, b, ck, maximum = 0, temp;
  scanf("%d %d %d", &r, &g, &b);
  if (r % 2 == 1) r++;
  r = r / 2;
  if (g % 2 == 1) g++;
  g = g / 2;
  if (b % 2 == 1) b++;
  b = b / 2;
  temp = 27 + r * 3;
  if (temp > maximum) maximum = temp;
  temp = 28 + g * 3;
  if (temp > maximum) maximum = temp;
  temp = 29 + b * 3;
  if (temp > maximum) maximum = temp;
  printf("%d\n", maximum);
  return 0;
}
