from sys import setrecursionlimit, stdin from collections import defaultdict, deque from itertools import permutations, combinations, product from functools import lru_cache from random import sample, choice, randint, random from bisect import bisect_left, bisect_right from heapq import heappush, heappop from math import factorial, exp from copy import copy, deepcopy from time import time setrecursionlimit(1 << 20) readline = stdin.readline # @lru_cache(maxsize = None) INF = 10 ** 18 MOD = 998244353 # MOD = 1000000007 DYDX = [(-1, 0), (1, 0), (0, -1), (0, 1)] ALP = 26 ''' Input ''' def I(): return int(readline()) def ST(): return readline()[:-1] def LI(): return list(map(int, readline().split())) def LII(): return list(map(lambda x: int(x) - 1, readline().split())) def SPI(): return map(int, readline().split()) def SPII(): return map(lambda x: int(x) - 1, readline().split()) def FIE(x): return [readline()[:-1] for _ in [0] * x] def NODE(N, edge): node = [[] for _ in [0] * N] for _ in [0] * edge: a, b = map(int, input().split()) node[a - 1].append(b - 1) node[b - 1].append(a - 1) return node def NODE_W(N, edge): node = [[] for _ in [0] * N] for _ in [0] * edge: a, b, c = map(int, input().split()) node[a - 1].append((b - 1, c)) node[b - 1].append((a - 1, c)) return node ''' Array ''' def cmin(dp, i, x): if x < dp[i]: dp[i] = x def cmax(dp, i, x): if x > dp[i]: dp[i] = x ''' Sorted Array ''' # x <= A[i] (minimum i meeting the requirement) def binary(sortedA, x): return bisect_left(sortedA, x) # x < A[i] (minimum i meeting the requirement) def binary2(sortedA, x): return bisect_right(sortedA, x + 1) # number of x in A def quantity(sortedA, x): return bisect_right(sortedA, x) - bisect_left(sortedA, x) ''' Alphabet ''' def id_a(s): return ord(s) - ord('a') def id_A(s): return ord(s) - ord('A') def st_a(i): return chr(ord('a') + i) def st_A(i): return chr(ord('A') + i) ''' Other''' def ranges(*args): return [(i, j) for i in range(args[0]) for j in range(args[-1])] def nynx(y, x, ly = INF, lx = INF): return [(y + dy, x + dx) for dy, dx in DYDX if 0 <= y + dy < ly and 0 <= x + dx < lx] def gen(x, *args): ret = [x] * args[-1] for e in args[:-1][::-1]: ret = [deepcopy(ret) for _ in [0] * e] return ret def is_prime(x): if x == 1 or x % 2 == 0: return x == 2 f = 3 while f * f <= x: if x % f == 0: return False f += 2 return True ''' Output ''' def puts(E): for e in E: print(e) def pprint(E): print() for e in E: print(e) def yn(x): print("Yes" if x else "No") def blank(arr): print(" ".join(map(str, arr))) def debug(*args): if DEBUG: for e in args: print(e) DEBUG = False ############################################################################################### A, B, C = SPI() ans = A // B * C + A % B * C / B print(ans)