#1和#4 RE

#5 RA 求大佬帮忙

num = input().split() m = int(num[0]) t = int(num[1]) s = int(num[2]) if t==0 : print("0") if t!=0 and s%t==0 :
print(int(m-(s/t))) elif t!=0 and s%t!=0 : print(int(m(s/t)-1))