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

int main()
{
	int a,ar[78498],b,cnt,max,sm,vl;
	cnt=max=vl=-1;

	while(vl<1000000)
	{
		vl++;
		if(prime(vl)==0)
			ar[cnt++]=vl;
	}
	cnt++;
	for(a=0;a<cnt;a++)
	{
		sm=0;
		for(b=a;b<cnt;b++)
			if(sm+ar[b]<1000000)
				sm+=ar[b];
			else
				b=cnt;
		if(prime(sm)==0&&(b-a)>max)
			max=sm;
	}
	printf("\n\t%i\n\n",max);
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;
		}
	}
}