# Enter your code here. Read input from STDIN. Print output to STDOUT

input = raw_input().split(' ')

#def calculate(a,b,initial_amount,total_time):

def power(x, y):
    if( y == 0):
        return 1
    temp = long(power(x, y/2))
    if (y % 2 == 0):
        return temp*temp
    else:
        return x*temp*temp

#print long(power( (long(input[0]) + long(input[1]))/2, long(input[2]))) % long(1000000007)

print pow( (long(input[0]) + long(input[1]))/2, long(input[2]), 1000000007)