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- #include <iostream>
- #include <string>
- using namespace std;
- int pier(int a)
- {
- if(a==0||a==1) return 0;
- if(a==2) return 1;
- if(a%2==0) return 0;
- for(int i = 3; i*i<=a;i+=2) if(a%i==0) return 0;
- return 1;
- }
- int main()
- {
- int p,k,sbp=0;
- cin>>p>>k;
- for(int i = p; i <=k; i++)
- {
- if(pier(i)==1)sbp++;
- }
- cout<<sbp;
- return 0;
- }
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