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- #include <bits/stdc++.h>
- using namespace std;
- ifstream fin("eratostene1.in");
- ofstream fout("eratostene1.out");
- int n, nr, cnt;
- bool isPrime(int nr)
- {
- if (nr <= 1)
- return false;
- if (nr <= 3)
- return true;
- if (nr % 2 == 0 || nr % 3 == 0)
- return false;
- for (int i = 5; i * i <= nr; i = i + 6)
- if (nr % i == 0 || nr % (i + 2) == 0)
- return false;
- return true;
- }
- int main()
- {
- int i;
- fin>>n;
- for( i=1; i<=n; i++)
- {
- fin>>nr;
- if(nr%2){
- if(isPrime(nr))
- cnt++;}
- else if(nr==2)
- cnt++;
- }
- fout<<cnt;
- return 0;
- }
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