in tổng chữ số của n là số nguyên tố 

python nha

from math import isqrt
def Check(n):
  if n < 2:
    return False
  for i in range(2, isqrt(n) + 1):
    if (n % i == 0):
      return False
  return True
def Sum(n):
  s = 0
  while n > 0:
    if Check(n % 10):
      s += n % 10
    n //= 10
  return s
n = int(input())
print(Sum(n))

`@`$\texttt{Python}$

from math import isqrt
def Check(n):
    if n < 2:
        return False
    for i in range(2, isqrt(n) + 1):
        if n % i == 0:
            return False
    return True

def TCS(n):
    s = 0
    while n > 0:
        x = n % 10
        if Check(x):
            s += x
        n //= 10
    return s
n = int(input())
print(TCS(n))

`@`$\texttt{C++}$

#include <bits/stdc++.h>
#define int long long
using namespace std;
bool Check(int n)
{
    if (n < 2)  return false;
    for (int i = 2; i <= sqrt(n); i ++)
    {
        if (n % i == 0)  return false;
    }
    return true;
}

int SPD(int n)
{
    int s = 0;
    while (n > 0)
    {
        int x = n % 10;
        if (Check(x)) s += x;
        n /= 10;
    }
    return s;
}
signed main()
{
  int n; cin >> n;
  cout << SPD(n) << endl;
}