#include<bits/stdc++.h>

#pragma gcc optimize("O3")
#pragma GCC target("avx2")
#pragma GCC optimize("unroll-loops")

#define all(s) s.begin(),s.end()
#define rc(x) return cout<<x<<endl,0
#define forn(i,n) for(int i=0;i<int(n);i++)
#define len(a) (int) (a).size()

#define pb push_back
#define mp make_pair
#define fr first
#define sc second

typedef long long ll;
typedef long double ld;

const int nmax=1e5+3;
const int mod=998244353;
const ll inf=0x3f3f3f3f3f3f3f3f;

/*===================*\
      comentarii:
\*===================*/

using namespace std;

int gcdex(int a,int b,int &x,int &y) {
  if(!b) {
    x=1;
    y=0;
    return a;
  }
  else {
    int d,x1,y1;
    d=gcdex(b,a%b,x1,y1);
    x=y1;
    y=x1-(a/b)*y1;
    return d;
  }
}

int a,b,x,y,d;
int main()
{
  freopen("inversmodular.in","r",stdin);
  freopen("inversmodular.out","w",stdout);
  ios_base::sync_with_stdio(0); cin.tie(0);
  cin>>a>>b;
  d=gcdex(a,b,x,y);
  if(x<=0)
   x=b+x%b;
  cin>>x;
}