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- #include <iostream>
- #include <fstream>
- using namespace std;
- int n, i, t, m, a;
- ifstream f("vterminal.in");
- ofstream g("vterminal.out");
- int prim(int n)
- {
- int i, ok = 1;
- if(n == 1)
- return 0;
- for(i = 2; i * i <= n; i++)
- if(n % i == 0)
- {
- ok = 0;
- break;
- }
- return ok;
- }
- int sumcif(int n)
- {
- int s = 0;
- while(n)
- {
- s += n % 10;
- n /= 10;
- }
- return s;
- }
- int main()
- {
- f >> n;
- for(i = 1; i <= n; i++)
- {
- f >> m;
- if(prim(m))
- t += sumcif(m);
- }
- while(t > 9)
- t = sumcif(t);
- g << t;
- return 0;
- }
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