#include<math.h>
void main()
{
int i,j,k;
int n=0;
for(i=50;i<=100;i++)
k=sqrt(i);
for(j=2;j<=k;j++)
if(i%j==0)
break;
if(j>=k+1)
printf("%d ",i);
n=n+1;
}
if(n%5==0)
printf("\n");
print("個數為%d",n) printf("\n");