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18 lines
274 B
C++
18 lines
274 B
C++
#include<cstdio>
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#include<stdlib.h>
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int main()
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{
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int n,m,c;
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while(scanf("%d%d%d",&n,&m,&c),(m+n+c))
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{
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int p,q;
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p=n-7;
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q=m-7;
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if((p*q)&1)
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printf("%d\n",(p*q)/2+c);
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else
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printf("%d\n",(p*q)/2);
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}
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return 0;
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}
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