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#include <iostream> #include <vector> #include <algorithm> #include <set> #include <cstring> using namespace std; typedef long long ll; bool prime[1000005]; bool visited[1000005]; int main() { ios_base::sync_with_stdio(false); memset(prime, true, sizeof prime); memset(visited, false, sizeof visited); prime[0] = false; prime[1] = false; for(ll i = 2; i <= 1000000; i++) { if(prime[i]) { for(ll j = i + i; j <= 1000000; j += i) { prime[j] = false; } } } string s; cin >> s; int ans =0 ; for(int i = 0; i < s.size(); i++) { ll tmp = 0; for(int j = 0; j < 6; j++) { if(i + j < s.size()) { tmp = (tmp * 10) + (s[i + j] - '0'); if(prime[tmp] and !visited[tmp]) { visited[tmp] = true; ++ans; } } } } cout << ans << endl; return 0; }
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