import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    V,T,P=MI()
    ans=0
    ans+=V*(P+1)
    ans+=ans//(T-1)+1

                
    print(ans)
        

    


main()