main(n){scanf("%d",&n);printf("%d",lround(exp(n-.577)));}

// import std.stdio;import std.math;int n;void main(){readf("%d",&n);write(round(exp(n-.577)));}
// import std.stdio;int n;void main(){readf("%d",&n);write([1,2,4,11,31,83,227][n]);}

// package main;import(."fmt";."math");func main(){n:=.0;Scan(&n);Print(int(Exp(n-.577)+.5))}
// package main;import."fmt";func main(){n:=0;Scan(&n);Print([]int{1,2,4,11,31,83,227}[n])}

main=do
n<-readLn
putStr.show.round.exp$n-0.577

<?=round(exp(fgets(STDIN)-.577));

print int exp(<>-.577)+.5

print int(2.718**(input()-.576)+.5)

cat(round(exp(scan("stdin")-.577)))

# kth Harmonic Number is approximately log(k) + γ.
# γ is Euler-Mascheroni constant and approximately 0.577.
# Reference:
#   http://mathworld.wolfram.com/HarmonicNumber.html
#   http://mathworld.wolfram.com/Euler-MascheroniConstant.html

# p Math.exp(gets.oct-0.577).round
# p [1,2,4,11,31,83,227][gets.oct]

// import scala.math._;object Main extends App{println(round(exp(readInt-.577)))}
// object Main extends App{println(Array(1,2,4,11,31,83,227)(readInt))}

awk '{print int(exp($1-.577)+.5)}'</dev/stdin

// JavaScript (spidermonkey)
// print(Math.round(Math.exp(readline()-.577)))
// print([1,2,4,11,31,83,227][readline()])

float s;main(i,n){scanf("%d",&n);while(s<=n)s+=1./i++;printf("%d",i-1);}

# Question:
#   Codeiq No.2928
# Reference:
#   https://oeis.org/A000254
#   https://oeis.org/A094310
i=s=0;n=gets.to_i;until s>n;i+=1;s+=1.0/i;end;p i