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- #include <iostream>
- using namespace std;
- int main() {
- int a0, b0, a2, b2, a5, b5, i, n, a, max;
- a0 = 0;
- b0 = 0;
- a2 = 0;
- b2 = 0;
- a5 = 0;
- b5 = 0;
- cin >> n;
- for (int i = 0; i < n; i++){
- cin >> a;
- if ( a % 2 != 0 && a % 5 != 0 && a >= a0){
- b0 = a0;
- a0 = a;
- }
- if ( a % 2 != 0 && a % 5 != 0 && a >= b0 && a < a0)
- b0 = a;
- if ( a % 2 != 0 && a % 5 == 0 && a >= a0 ){
- b5 = a5;
- a5 = a;
- }
- if ( a % 2 != 0 && a % 5 == 0 && a >= b5 && a < a5)
- b5 = a;
- if ( a % 2 == 0 && a % 5 != 0 && a >= a2){
- b2 = a2;
- a2 = a;
- }
- if ( a % 2 == 0 && a % 5 != 0 && a >= b0 && a < a0)
- b2 = a;
- }
- max = a0*b0;
- if (a0*a2 > max)
- max = a0*a2;
- if (a0*a5 > max)
- max = a0*a5;
- if (a5*b5 > max)
- max = a5*b5;
- if (a2*b2 > max)
- max = a2*b2;
- cout << max << endl;
- return 0;
- }
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