C :

#include<stdio.h>
int ysum(int a)
{
	int sum=0;
	for(int i=1;i<a;i++){
		if(a%i==0) sum+=i;
	}
	return sum;
}
int main()
{
	int n,s=0;
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		if(ysum(i)==i) s++;
	}
	printf("%d",s);
	return 0;
}

C++ :

#include <iostream>
#include <cmath>

using namespace std;
int yinzihe(int n){
	int i,s=1;
	for(i=2;i<=sqrt(n);i++){
		if(n%i==0){
			s+=i;
			s+=n/i;
		}
	}
	return s;
}
int main(){
	int i,n,c=0;
	cin>>n;
	for(i=2;i<=n;i++){
		if(yinzihe(i)==i){
			c++;
		}
	}
	cout<<c<<endl;
}

Python :

def wanMeiShu(n):
   s = 0
   for i in range(1,n):
      if n % i == 0:
         s += i
   if s == n :
       return 1
   else:
       return 2
n=int(input())
s=0
for i in range(1,n + 1):
   if wanMeiShu(i) == 1:
   	s+=1
print(s)