#include <stdio.h>
int
main()
{
freopen
(
"input.txt"
,
"r"
,stdin); //(1)
freopen
(
"output.txt"
,
"w"
,stdout); //(2)
int
a,b,c;
scanf
(
"%d %d %d"
,&a,&b,&c);
if
(a*b<c)
printf
(
"%d"
,0);
else
printf
(
"%d"
,(a*b)-c);
return
0;}
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