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  1. import java.util.Map;
  2. import java.util.Scanner;
  3. import java.io.OutputStream;
  4. import java.io.IOException;
  5. import java.util.Arrays;
  6. import java.io.PrintWriter;
  7. import java.util.HashMap;
  8. import java.io.InputStream;
  9.  
  10. /**
  11.  * Built using CHelper plug-in
  12.  * Actual solution is at the top
  13.  * @author aajjbb
  14.  */
  15. public class Main {
  16.     public static void main(String[] args) {
  17.         InputStream inputStream = System.in;
  18.         OutputStream outputStream = System.out;
  19.         Scanner in = new Scanner(inputStream);
  20.         PrintWriter out = new PrintWriter(outputStream);
  21.         EasyNumberChallenge solver = new EasyNumberChallenge();
  22.         solver.solve(1, in, out);
  23.         out.close();
  24.     }
  25. }
  26.  
  27. class EasyNumberChallenge {
  28.     public void solve(int testNumber, Scanner in, PrintWriter out) {
  29.         int a = in.nextInt(), b = in.nextInt(), c = in.nextInt();
  30.         Map<Triplet, Long> map = new HashMap<Triplet, Long>();
  31.         long ans = 0L;
  32.         for(int i = 1; i <= a; i++) {
  33.             for(int j = 1; j <= b; j++) {
  34.                 for(int k = 1; k <= c; k++) {
  35.                     Triplet now = new Triplet(i, j, k);
  36.                     if(map.containsKey(now)) {
  37.                         ans += map.get(now);
  38.                     } else {
  39.                         long tmp = countDiv(i*j*k);
  40.                         map.put(now, tmp);
  41.                         ans += tmp;
  42.                     }
  43.                 }
  44.             }
  45.         }
  46.         out.println(ans);
  47.     }
  48.     public long countDiv(long n) {
  49.         if(n == 1L) return 1L;
  50.  
  51.         int x = (int) Math.sqrt(n);
  52.         int counter = 0;
  53.  
  54.         for(int i = 1; i <= x; i++) {
  55.             if(n % i == 0) {
  56.                 counter += 2;
  57.             }
  58.         }
  59.         if(x * x == n) counter -= 1;
  60.         return counter;
  61.     }
  62.     class Triplet {
  63.         public int a, b, c;
  64.  
  65.         public Triplet(int a1, int b1, int c1) {
  66.             int[] tmp = {a1, b1, c1};
  67.             Arrays.sort(tmp);
  68.             a = tmp[0]; b = tmp[1]; c = tmp[2];
  69.         }
  70.  
  71.         @Override
  72.         public boolean equals(Object o) {
  73.             Triplet triplet = (Triplet) (o);
  74.             return (this.a == triplet.a) && (this.b == triplet.b) && (c == triplet.c);
  75.         }
  76.     }
  77. }
Success #stdin #stdout 0.57s 216064KB
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https://ideone.com/Nb3DW1
language:
Java (12.0.1)
created:
12 years ago
visibility:
secret

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