#include <stdio.h>
#include <stdbool.h>

void main(void){
	int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    bool nFlg = false;
    for(int i = 1 ; i <= 200000 ; i++){
        if(i*a - b > c){
            break;
        }
        if((i*a -b == c) || ((i*a-b <= 0) && (i*a == c ))){
            printf("%d\n",i);
            if(!nFlg){
                nFlg = true;
            }
        }
    }
    if(!nFlg){
        printf("-1");
    }
}