n,a,b,k=map(int,input().split())
m=10**9+7
s = (a*a+b*b+k)%m
s = (s*pow(a,-1,m))%m
s = (s*pow(b,-1,m))%m
z=[[s,-1],[1,0]]
mod=10**9+7
def ff(a,b):
    return a[0]*b[0]+a[1]*b[1]
#a*bの計算
def mat_mul(a,b):
    n,m,l=len(a),len(b[0]),len(b)
    c=[[0]*m for _ in range(n)]
    for i in range(n):
        for k in range(l):
            for  j in range(m):
                c[i][j]=(c[i][j]+a[i][k]*b[k][j])%mod
    return c
 
#a^nの計算
def mat_pow(a,n):
    m=len(a)
    b=[[0]*m for _ in range(m)]
    for i in range(m):
        b[i][i]=1
    while n>0:
        if n&1:
            b=mat_mul(b,a)
        a=mat_mul(a,a)
        n>>=1
    return b
#print(z)
if n>=3:
    ans=mat_pow(z,n-2)
    print(ff(ans[0],[b,a])%mod)
    #print(ans)
    #print(b)
else:
    if n==1:
        print(a)
    else:
        print(b)