import sys
input = sys.stdin.readline

V,T,P=map(int,input().split())

A=V*(P+1)-1

OK=0
NG=10**18

while NG-OK>1:
    mid=(OK+NG)//2

    if (A+mid)//T>=mid:
        OK=mid
    else:
        NG=mid
print(A+OK+2)