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- #include<stdio.h>
- int kiemtra(int n){
- if(n<2) return 0;
- for(int i=2;i<n;i++){
- if(n%i==0) return 0;
- }
- return 1;
- }
- int chuso(int n){
- while(n){
- if(!kiemtra(n%10)) return 0;
- n/=10;
- }
- return 1;
- }
- int tong(int n){
- int sum=0;
- while(n){
- sum+=n%10;
- n/=10;
- }
- if(!kiemtra(sum)) return 0;
- return 1;
- }
- int main(){
- int a,b;
- scanf("%d %d",&a,&b);
- int count=0;
- for(int i=a;i<=b;i++){
- if(kiemtra(i)&&chuso(i)&&tong(i)) count++;
- }
- printf("%d",count);
- }
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