#include <cstdint>
#include <fstream>
#include <iostream>
#include <string>

int main() {
  std::fstream input("input");
  std::string currentLine = "";
  uint64_t totalJolt = 0, lineLength = 0;
  while (std::getline(input, currentLine)) {
    char mostSignificantDigit = '0', leastSignificantDigit = '0';
    lineLength = currentLine.length();
    for (uint16_t currentPosition = 0; currentPosition < lineLength;
         currentPosition++) {
      char digit = currentLine[currentPosition];

      if (mostSignificantDigit < digit) {
        // Since this is the last digit
        if (currentPosition == lineLength - 1) {
          leastSignificantDigit = digit;
          continue;
        }

        // Otherwise business as usual
        mostSignificantDigit = digit;
        leastSignificantDigit = '0';
        continue;
      }

      if (leastSignificantDigit < digit) {
        leastSignificantDigit = digit;
      }
    }

    // Just a simple char > uint conversion
    totalJolt +=
        (10 * (mostSignificantDigit - 48)) + (leastSignificantDigit - 48);
  }
  std::cout << totalJolt << "\n";
  return 0;
}