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#include <iostream>
#include <fstream>
#include <sstream>
#include <cstring>
#include <vector>
#include <cmath>
int main(void)
{
long time{};
long distance{};
std::ifstream input{ "resources/input.txt" };
if (input.is_open())
{
long n;
std::string line;
/* Time */
std::getline(input,line);
for(unsigned char c : line)
{
if (std::isdigit(c))
{
time *= 10;
time += c - '0';
}
}
/* Distance */
std::getline(input,line);
for(unsigned char c : line)
{
if (std::isdigit(c))
{
distance *= 10;
distance += c - '0';
}
}
}
input.close();
double delta = std::sqrt(time * time - 4 * distance);
long from{ static_cast<long>(1 + (time - delta) / 2)};
long to{ static_cast<long>(std::ceil((time + delta) / 2)) };
std::cout << to - from << std::endl;
return 0;
}
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