#include<stdio.h>
int main()
{double data1,data2,data;
char op; scanf("%lf%c%lf",&data1,&op,&data2); switch(op) {case '+':data=data1+data2;break; case '-':data=data1-data2;break; case '*':data=data1*data2;break; case '/':if(data2)data=data1/data2;?else {printf("除數不能為0!\n"); return 0;}
} printf("%g%c%g=%g\n",data1,op,data2,data); return 0;}