#include <bits/stdc++.h>
using namespace std;
inline long long read() {
  long long n = 0, f = 1, ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    n = n * 10 + ch - '0';
    ch = getchar();
  }
  return n * f;
}
long long gcd(long long m, long long n) {
  if (m == 0) return n;
  if (n == 0) return m;
  while (m ^= n ^= m ^= n %= m)
    ;
  return n;
}
signed main() {
  long long t, m, d, w, sth, x;
  t = read();
  for (long long i = 1; i <= t; i++) {
    m = read();
    d = read();
    w = read();
    sth = gcd(d - 1, w);
    w /= sth;
    x = min(m, d);
    printf("%lld\n", (x % w) * (x / w + 1) * (x / w) / 2 +
                         (w - x % w) * (x / w) * (x / w - 1) / 2);
  }
  return 0;
}
