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
rest=C

total+=x*D
age+=x*A
rest=C-total

while C>total:
    if A>=C:
        age=C
        break
    elif rest<A:
        age+=rest
        break
    elif rest>=A:
        age+=A
        break
        
print(age)