'''
a,b = input().split()
a = int(a)
b = int(b)
if b>a:
for i in range(a, b+1):
print(i, end = ' ')
else:
for i in range(b, a+1):
print(i, end = ' ')
'''
'''
a, b = input().split()
a = int(a)
b = int(b)
for i in range(a, b+1):
if i%2!=0:
print(i, end = ' ')
'''
# 1 to 10 add > total > ? > 1+2+3+4+5+^+&+8+(+)+10 =
'''
x = int(input())
s = 0
for i in range(1, x+1):
s += i
print(s)
'''
# 2, 4, 6, 8 = even
# 1, 3, 5, 7 = odd
'''
n = input()
n = int(n)
s = 0
for i in range(1, n+1):
if i%2==0:
s += i
print(s)
'''
'''
a,b = input().split()
a = int(a)
b = int(b)
s = 0
for i in range(a, b+1):
if i%3==0:
s += i
print(s)
'''
'''
n = int(input())
data = input().split()
s = 0
for i in range(len(data)):
data[i] = int(data[i])
s += data[i]
print(s)
'''
'''
n = input()
n = int(n)
data = input().split()
s = 0
for i in range(len(data)):
data[i] = int(data[i])
if data[i]%5==0:
s += data[i]
print(s)
'''
'''
n = int(input())
data = input().split()
s = 0
for i in range(len(data)):
data[i] = int(data[i])
if data[i]%2==0:
s += data[i]%2==0
print(s)
'''
a,d,n = input().split()
a = int(a)
d = int(d)
n = int(n)
s = 0
for i in range(n-1):
a += d
print(a)
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