SIGSEGV in FACTCG2

[abshkmodi]

i m using Sieve of eratosthenes & getting segfault. I can't understand the reason. Here's my code

#include<stdio.h>
int main(){
	long long int i,j;
	unsigned short int a[10000001]={1,1};
	int b[700000],p[700000],count=0,pc,n,temp;
	for(i=2;i<=10000000;i++){
		if(a[i]==0){
			b[++count]=i;
			for(j=i*i;j<=10000000;j+=i)
				a[j]=1;}}
	while(scanf("%d",&n)!=EOF){
		for(i=1;i<=count;i++){
			pc=0;
			temp=n;
			if(b[i]<=n){
				while(temp%b[i]==0){
					pc++;
					temp /=b[i];}}
				p[i]=pc;}
		if(n==1)
			printf("1");
		else{
			printf("1");
			for(i=1;i<=count;i++){
				if(p[i])
					for(j=1;j<=p[i];j++){
						printf(" x %d",b[i]);}}}
		printf("\n");}
	return(0);}

[system]

 unsigned short int a[10000001]={1,1};
   int b[700000],p[700000],count=0,pc,n,temp;

Use dynamic memory allocation for large arrays.