#include<stdio.h>
main()
{
int n
,m
,i
;
scanf("%d %d",&n
,&m
);
if(m
>n
)
{ i
=m
;
m
=n
;
n
=i
;
}
while(n
%m
!=0)
{n
=n
%m
;
if(m
>n
)
{ i
=m
;
m
=n
;
n
=i
;
}
}
printf("%d",m
);
}
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