#include <stdio.h>
#include <math.h>

int gcd(int a, int b);

int main(int argc, char *argv[])
{
    int lim = 1500000;
    int i, n, m, p, c, odd;
    char sieve[lim + 1];
    
    for(i = 0; i <= lim; ++i){
        sieve[i] = 0;
    }
    odd = c = 0;
    for(n = 2; n <= (sqrt(2*lim + 1) - 1)/ 2; ++n){
        for(m = odd + 1; m < n && m <= (lim / 2*n) - n; m += 2){
            if(gcd(n, m) == 1){
                p = 2*n * (n + m);
                for(i = p; i <= lim; i += p){
                    sieve[i] += 1;
                }
            }
        }
        odd = !odd;
    }
    for(i = 0; i <= lim; i += 2){
        if(sieve[i] == 1){
            ++c;
        }
    }
    printf("%d\n", c);
}

int gcd(int a, int b)
{
  int c;
  while (a != 0){
     c = a; a = b%a;  b = c;
  }
  return b;
}