ln=list(map(int,input().split()))
A=ln[0]
B=ln[1]
C=ln[2]
D=A+B-1
x=C//D
total=0
age=0

total+=x*D
age+=x*A


while total<C:
    age+=1   
    if age%A==0:
        total+=B
    else:
        total+=1
    
            
print(age)