#include<bits/stdc++.h>
using namespace std;
int c,a[1001],s;
bool f(long long x){
for(long long i=2;i<=sqrt(x);i++){
if(x%i==0){
return false;
}
return true;
}
int main(){
freopen("p1303.in","r",stdin);
freopen("p1303.out","w",stdout);
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d",&a[i]);
}
for(int i=1;i<=n-2;i++){
for(int j=i+1;j<=n-1;j++){
for(int k=j+1;k<=n;k++){
if(f(a[i]+k[j]+a[k])){
t++;
}
}
}
}
printf("%d",s);
fclose(stdin);
fclose(stdout);
return 0;
}
( 2026/6/14 19:06:41 ) |
54188
正确答案。