#include <stdio.h>

void printUsage() {
  printf("Usage: min < [data file], where the file is a "
         "non-empty list of integers\n");
}

int main() {
  int min;

  // 1. obtain the first value as min
  if (scanf("%d", &min) != 1) {
    // either empty file or not an integer
    printUsage(); 
    return -1;
  }

  // 2. scan the rest
  // A busy line of code:
  //  a. call scanf, requesting to scan for an integer that
  //     should be written to val
  //  b. set rc to the return code (EOF, 0, or 1)
  //       EOF - end of file
  //         0 - did not match an integer
  //         1 - matched an integer
  //  c. check if the return code is (not) EOF
  int rc, val;
  while ((rc = scanf("%d", &val)) != EOF) {
    // not EOF, but it might be 0
    if (rc == 0) {
      // bad data
      printUsage();
      return -1;
    }
    // good data
    if (val < min)
      min = val;
  }

  // 3. report the min
  printf("Min: %d\n", min);

  return 0;
}