不知道是我看不懂題目還是??

感謝!!

#include<cstdio>

#include<algorithm>

using namespace std;

main(){

int a,b;

while(scanf("%d %d",&a,&b)!=EOF){

int ans=0;

for (int i=min(a,b);i<=max(a,b);i++){

//printf("i=%d ",i);

for (int j=2;j<i;j++){

//printf("j=%d ",j);

if(i%j==0 or j>2 and j%2==2) break;

if (j==i-1) ans++;

}

}

printf("%d\n",ans);

}

}