import strutils
let n = stdin.readLine().parseInt()
if n >= 50: quit("000000000000",0)
const answers = [
  "1","1","2","6","24","120","720","5040","40320","362880","3628800","39916800","479001600","6227020800","87178291200","307674368000","922789888000",
  "687428096000","373705728000","100408832000","008176640000",
  "171709440000","777607680000","884976640000","239439360000",
  "985984000000","635584000000","160768000000","501504000000",
  "543616000000","308480000000","562880000000","012160000000",
  "401280000000","643520000000","523200000000","835200000000",
  "902400000000","291200000000","356800000000","272000000000",
  "152000000000","384000000000","512000000000","528000000000",
  "760000000000","960000000000","120000000000","760000000000",
  "240000000000"]
echo answers[n]