#line 1 "a.cpp"
#include<iostream>
#include<atcoder/modint>
using namespace std;
#line 1 "/home/kotatsugame/library/math/squarematrix.cpp"
#include<array>
template<typename T,unsigned int N>
struct Matrix{
	array<array<T,N>,N>dat;
	array<T,N>&operator[](int i){return dat[i];}
	const array<T,N>&operator[](int i)const{return dat[i];}
	static Matrix eye(){
		Matrix res;
		for(int i=0;i<N;i++)res[i][i]=1;
		return res;
	}
	Matrix operator+(const Matrix&A)const{
		Matrix res;
		for(int i=0;i<N;i++)for(int j=0;j<N;j++)
			res[i][j]=dat[i][j]+A[i][j];
		return res;
	}
	Matrix operator*(const Matrix&A)const{
		Matrix res;
		for(int i=0;i<N;i++)for(int k=0;k<N;k++)for(int j=0;j<N;j++)
			res[i][j]+=dat[i][k]*A[k][j];
		return res;
	}
	Matrix pow(long long n)const{
		Matrix a=*this,res=eye();
		for(;n;a=a*a,n>>=1)if(n&1)res=res*a;
		return res;
	}
};
#line 5 "a.cpp"
using mint=atcoder::modint1000000007;
using mat=Matrix<mint,2>;
main()
{
	long N,A,B,K;
	cin>>N>>A>>B>>K;
	if(N==1)
	{
		cout<<A<<endl;
		return 0;
	}
	mat X;
	X[0][0]=mint(A*A+B*B+K)/A/B;
	X[0][1]=-1;
	X[1][0]=1;
	X=X.pow(N-2);
	cout<<(X[0][0]*B+X[0][1]*A).val()<<endl;
}