40 lines
685 B
C++
40 lines
685 B
C++
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#include <cstring>
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#include <iostream>
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using namespace std;
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int sushu(int n)
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{
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if(n==1){
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return 0;
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}
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for (int i = 2; i * i <= n; i++) {
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if (n % i == 0) {
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return 0;
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}
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}
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return 1;
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}
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int huiwen(string n)
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{
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int len = n.size() - 1;
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for (int i = 0; i <= len / 2; i++) {
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if (n[i] != n[len - i]) {
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return 0;
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}
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}
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int s = 0;
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for (int i = n.size() - 1; i >= 0; i--) {
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s *= 10;
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s += n[i]-'0';
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}
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return sushu(s);
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}
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int main()
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{
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int ans = 0;
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string n;
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while (cin >> n) {
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ans += huiwen(n);
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}
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cout<<ans;
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}
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