#include<stdio.h>

typedef long long int ln;

void run(void){
  ln n;
  scanf("%lld",&n);
  if(n%2==0){
    n/=2;
  }

  ln ans=1;
  ln k=2;
  ln t=1;
  while(n%k==0){
    t*=k;
    n/=k;
  }
  ans*=2*t-1;

  k=3;
  t=1;
  while(n%k==0){
    t*=k;
    n/=k;
  }
  ans*=(k*t-1)/(k-1);

  int add=2;
  k=5;
  while(k*k<=n){
    t=1;
    while(n%k==0){
      t*=k;
      n/=k;
    }
    ans*=(k*t-1)/(k-1);
    k+=add;
    add^=6;
  }
  if(n>1){
    ans*=n+1;
  }
  printf("%lld\n",ans);
  return;
}

int main(void){
  run();
  return 0;
}