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#include <bits/stdc++.h>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int n,m;
void Euclid(int a,int b, int &x, int &y){
if(b==0){
x=1;
y=1;
}
else{
int x1,y1;
Euclid(b,a%b,x1,y1);
x=y1;
y=x1-(a/b)*y1;
}
}
int main(){
int n,m;
fin>>n>>m;
int x,y;
Euclid(n,m,x,y);
while(x<0){
x+=m;
}
fout<<x;
return 0;
}