#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    
    int tens = n / 10;   // 获取十位数字
    int units = n % 10;  // 获取个位数字
    
    double result = (double)tens / units;  // 计算十位除以个位的结果
    printf("%.1f\n", result);  // 输出结果，保留一位小数
    
    return 0;
}
/**************************************************************
	Problem: 1607
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/