#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int z(int a,int s){ int sum=0; for(int i=a;i<=s;i++){ sum+=i; } return sum; } int main(){ int n,m; cout<<z(10,20)<<endl; cout<<z(30,35)<<endl; cout<<z(35,45)<<endl; return 0; }