#include <stdio.h>
void func(int n){
//ここから
 int count;
	count++;
 
//ここまでを埋めてください
    printf("%dは%d番目の素数\n", n, count);
}
//引数nが素数かどうかの判定をします
//素数なら１を戻り値として返し，素数でなければ0を返します
int prime(int n){
    int i;
    int sosuu = 1;
    for(i=2; i<n; i++){
        if(n%i == 0){ 
           sosuu=0;
           break;
        }
    }
    return sosuu;
}
 
int main(void) {
    int x;
    for(int i=2; i<20;i++){
        x = prime(i);
    if (x == 1){
        func(i);
    }
}
	return 0;
}
 

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