CCF-(201709-1)打酱油-C语言(100分)

#include <stdio.h>
#define PRICE 10

int main(){
    int N,num=0;
    scanf("%d",&N);
    while(N>=10){
        if(N>=5*PRICE){
            N-=5*PRICE;
            num+=7;
        }
        else if(N>=3*PRICE){
            N-=3*PRICE;
            num+=4;
        }
        else{
            N-=PRICE;
            num++;
        }
    }
    printf("%d",num);
    return 0;
}