#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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