while 1:
    try:
        a,b,c=map(int,input().split())
    except: break

    lo,hi=1,int(1e18)
    while lo<hi:
        mi=(lo+hi)//2
        x=mi//a
        y=mi-x
        if x*b+y>=c:
            hi=mi
        else:
            lo=mi+1
    print(lo)