#include<stdio.h>
int main()
{
    float acc;
    int n;
    float tran;
    float each;
    scanf("%.2f",&acc);
    scanf("%d",&n);
    scanf("%.2f",&tran);
    scanf("%.2f",&each);
    float final=acc+tran+each;
    printf("%.2f",final);
    return 0;
}