#include <stdio.h>
int main(void) {
int enzan,a,b,c;
scanf("%d %d %d",&enzan
,&a
,&b
); switch(enzan)
{
case 1:
c=a+b;
break;
case 2:
c=a-b;
break;
case 3:
c=a*b;
break;
case 4:
c=a/b;
break;
}
return 0;
}
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