#include <iostream>
typedef long long ll;
using namespace std;
bool ll_is_valid(ll t, ll N, ll x, ll y)
{
return t / x + (t - x) / y >= N;
}
ll f(ll N, ll x, ll y)
{
ll R = 1;
while (!ll_is_valid(R,N,x,y)) R *= 2;
ll L = R / 2;
while(R - L > 1)
{
ll M = (L + R) / 2;
if (!ll_is_valid(M,N,x,y)) {L = M;}
else {R = M;}
}
return R;
}
int main()
{
ll N,x,y;
cin >> N >> x >> y;
if(x > y) swap( x, y );
cout << f(N, x, y) << std::endl;
}
№1
x = int(input())
a = x // 100 > 0 and x > 0 and x % 10 == 0
print('a =', a)
b = x % 2 != 0 and (x % 3 == 0 or x % 5 == 0)
print('b =', b)
c = 2 <= x <= 6
print('c =', c)
d1 = x % 10
d2 = x // 10 % 10
d3 = x // 100
d = d3 > 0 and d1 == d2 == d3
print('d =', d)
№2
x = int(input())
a = abs(x) + 5 > 3
print(a)
b = abs(x) + 5 < 3
print(b)
Объяснение: