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#include <bits/stdc++.h>
#define int long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void solve(int a, int b, int &x, int &y)
{
if (!b)
x = 1, y = 0;
else
{
solve(b, a % b, x, y);
int aux = x;
x = y;
y = aux - y * (a / b);
}
}
int32_t main()
{
int a, b, x = 0, y;
f >> a >> b;
solve(a, b, x, y);
if (x < 1)
x += b;
g << x;
return 0;
}