?? 2267.cpp
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/* This Code is Submitted by wywcgs for Problem 2267 on 2006-06-03 at 17:20:14 */
#include <cstdio>
int main()
{
int n, m;
while(scanf("%d %d", &n, &m) != EOF && !(n == 0 && m == 0))
printf("%d\n", 3*n-m);
return 0;
}
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