#include <stdio.h>
#include <math.h>

int isPrime(long);

int main(){
   long c,t=3;
   for(c=1;c<=10001;t+=2)if(isPrime(t))c++;
   printf("%d\n", t);
   return 0;
}

int isPrime(long x){
   int i;

   if(x==2||x==3)  return 1;    //if i = 2 or 3, return true
   if(!(x&1))      return 0;    //if x is even  return false

//if x is divisible by i return false
   for(i=3;i<=sqrt(x);i+=2)if (x%i == 0) return 0;

   return 1;
}