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uses crt;
var i,n,t,j,kt:integer;
begin
clrscr;
readln(n);
t:=0;
for i:=2 to n do
if n mod i=0 then
begin
kt:=0;
for j:=2 to trunc(sqrt(i)) do
if i mod j=0 then kt:=1;
if kt=0 then t:=t+i;
end;
write(t);
readln;
end.
N = int(input())
A = 0
B = 0
So_uoc = 0
KQ = ""
for x in range(1, N):
if (x%2==0) and (x%3==0):
A += 1
if (x>0) and (N%x==0):
if (x>B):
B = x
for i in range(1, N+1):
if (N%i==0):
So_uoc += 1
if (So_uoc == 2):
KQ = "YES"
else:
KQ = "NO"
print(A)
print(B)
print(len(str(N)))
print(KQ)
(Chẳng biết đúng không đâu 
)
const fi='divk.inp';
fo='divk.out';
var f1,f2:text;
a:array[1..100]of integer;
i,n,k,dem,j,x,t:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,n,k);
for i:=1 to n do
read(f1,a[i]);
dem:=0;
for i:=1 to n do
for j:=1 to n do
begin
if i<j then
begin
t:=0;
for x:=i to j do
t:=t+a[x];
if t=k then inc(dem);
end;
for i:=1 to n do
if k=a[i] then inc(dem);
writeln(f2,dem);
close(f1);
close(f2);
end.
#include <bits/stdc++.h>
using namespace std;
#define nhungcute ios_base::sync_with_stdio; cin.tie(0); cout.tie(0);
const int N=1500;
long long n,k,a[N],i,j,c[N][101];
int main(){
nhungcute
cin>>n>>k;
for(i=1;i<=n;i++)
cin>>a[i];
for(i=1;i<=n;i++){
a[i]=a[i]%k;
}
for(i=1;i<k;i++)
c[1][i] =-1e9;
c[1][a[0]]=0;
c[1][a[1]]=1;
for(i=2;i<=n;i++){
for(j=0;j<k;j++){
c[i][j]=max(c[i-1][j],c[i-1][(j-a[i]+k)%k]+1);
}
}
cout<<c[n][0];
return 0;
}
#include <iostream>
#include <map>
using namespace std;
int main() {
int n;
cin >> n;
map<int, int> count;
for (int i = 0; i < n; i++) {
int x;
cin >> x;
count[x]++;
}
int ans = 0;
for (auto p : count) {
int x = p.second;
ans += (x * (x - 1)) / 2;
}
cout << ans;
return 0;
}
#include <bits/stdc++.h>
using namespace std;
long long n,i,x,t,dem;
//chuongtrinhcon
bool kthh(long long n)
{
if (n<=1) return(false);
else
long long t=0;
for (long long i=1; i<=n/2;i++)
if (n%i==0) t=t+i;
if (t==n) return(true);
else return(false);
}
//chuongtrinhchinh
int main()
{
freopen("hoanhao.inp","r",stdin);
freopen("hoanhao.out","w",stdout);
cin>>n;
t=0;
dem=0;
for (i=1; i<=n; i++)
{
cin>>x;
if (kthh(x)==true)
{
dem++;
t=t+x;
}
}
cout<<dem<<endl;
cout<<t;
return 0;
}
giup toi