#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
	int a,b,cont,sum,val,val1;
	cont=sum=0;val=21;
	
	do{		
		val+=2;
		a=prime(val);
		b=1;
		if(a==0)
		{	
			printf("\n%i primo in sé",val);
			val1=val/10;			
			while(!(val1%10==0&&val1/10==0)&&a==0)
			{									
				if(val1!=1)								
					a=prime(val1);
				else
					a=1;
				if(a==0)
				{
					b++;
					val1=val1/10;
				}
			}
			if(a==0)
			{
				printf(" ..1.. ");
				for(a=10;b>0;b--)
					a=a*10;
				b=a;
				a=0;
				val1=val;								
				while(val1%b!=0&&val1/b<val1&&a==0)
				{					
					if(val1%b!=1)
						a=prime(val1%b);
					else
						a=1;
					if(a==0)
						b=b/10;				
				}
				if(a==0)
				{	
					sum+=val;
					cont++;	
					printf(" ..2.. cont:%i",cont);								
					getc(stdin);
				}				
			}
		}
	}while(cont<11);
	printf("\n\n\tsum: %i\n\n",sum);
system("pause");
return 0;
}
int prime(int val)
{
	switch(val)
	{
		case 0:				//
		case 1:return 1;break;		//  I have to specify these special numbers because the 'default' case would interpret them incorrectly!
		case 2:return 0;break;		//  
		default:{
				if(val%2!=0)
				{
					int a=3;
					for(;a<sqrt(val)+1;a+=2)
						if(val%a==0)
							return 1;
				}
				else
					return 1;
				return 0;
		}
	}
}