#include <stdio.h>
int func(int n){
	if(n == 0){
		return -1;
	}else 
	for(int i=n;i==0;i--){
		n = 3*n+5;
	}
	return n;
}
 
int main(void) {
	int n = 3;
	printf("数列anについて、n=%dのときの値は%d\n",n
,func
(n
)); 	return 0;
}
 
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