import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

B,C,D = map(int,read().split())

MOD = 10**9 + 7

def power(n):
    """return x^n modulo x^2 - (C+1) x + C"""
    if n == 0:
        return 1, 0
    a,b = power(n//2)
    a,b = a*a - C * b * b, 2 * a * b + (C+1) * b * b
    a,b = a % MOD, b % MOD
    if n % 2 == 0:
        return a,b
    a,b = -C * b, a + (C+1) * b
    a,b = a % MOD, b % MOD
    return a,b

a,b = power(D)
answer = B * b * C % MOD
print(answer)