#include <iostream> using namespace std; int a[100010] = {0}; int main() { int n,num=1; for(int i = 3;;i++) { if(i%3==0 || i%5==0) { a[num++] = i; } if(num>100010) break; } while(scanf("%d",&n)!=EOF) { printf("%d\n",a[n]); } return 0; }