#include <stdio.h>
int main(void) {
int a,b,s=0;
for(int i=2;i<a/2;i++){
b=a%i;
if(b==0){
s=1;
break;
}
}
if(s
==0 && a
!=1)printf("%dは素数です",a
); return 0;
}
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