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C:\test\C>gcm 3221225472
anonyM: gcm for s=3221225472 & r=1 to 1610612736 took:13.076620219
oiskuu: gcm for s=3221225472 & r=1 to 1610612736 took: 0.000000041

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#include <stdio.h>
#include <stdlib.h>
...
    return;
}