import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {

  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    int[] target = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    
    int count = 1;
    int e = 1;
    int s = 1;
    int m = 1;
    while (true) {
      if (e == target[0] && s == target[1] && m == target[2]) {
        System.out.println(count);
        break;
      }
      e = count % 15 + 1;
      s = count % 28 + 1;
      m = count % 19 + 1;
      count++;
    }
  }

}