#include <bits/stdc++.h>
int main( ) {
int a, b, c, p, q, r[3];
scanf("%d%d%d", &a, &b, &c);
p = a / b / c;
q = b - c + a + p;
r[0] = a * p / q * q;
r[1] = r[0] * (r[0] - 300);
if (3 * q - p % 3 <= r[0] && r[2] == r[2])
r[1] = r[r[0] / p % 2];
else
r[1] = q % p;
printf("%d\n", r[0] - r[1]);
return 0;
}
输入：100 7 3
输出：1
