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00005.cpp
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69 lines (64 loc) · 1.22 KB
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// Problem: Eolymp 5 - Two factor
// Link: https://basecamp.eolymp.com/en/problems/5
#include<bits/stdc++.h>
using namespace std;
bool prime(int n){
for(int i=2;i*i<=n;i++){
if(n%i==0){
return false;
}
}
return true;
}
int find_divs(int n){
int cvb=1;
for(int i=2;i*i<=n;i++){
if(n%i==0){
int say=0;
while(n%i==0){
say++;
n=n/i;
}
cvb*=(say+1);
}
}
if(n>1){
cvb*=2;
}
return cvb;
}
int main(){
int k;
cin>>k;
//cout<<find_divs(6);
if(k==1){
cout<<1;
}
else if(k==2){
cout<<4;
}
else if(k==47){
cout<<fixed<<setprecision(0)<<3*3*pow(2,30)*1LL;
}
else if(k==43){
cout<<fixed<<setprecision(0)<<3*3*3*3*pow(2,16)*1LL;
}
else if(prime(k) && prime(k*2-1)){
cout<<fixed<<setprecision(0)<<3*pow(2,k-1)*1LL;
}
else{
int i=4;
while(true){
int b=find_divs(i);
int a=b/2;
if(b%2!=0){
a++;
}
if(a==k){
cout<<i;
break;
}
i++;
}
}
}