#include<stdio.h>

int sum(){
    int i, sum=0;
    for(i=1; i<=100; i++){
        sum+=i;
    }
    return sum;
}
int sum2(int m, int n){
    int i, sum=0;
    for(i=m; i<=n; i++){
        sum+=i;
    }
    return sum;
}
int sum3(int m, int n){
    int i, sum=0;
    for(i=m; i<=n; i++){
        sum+=i;
    }
    return sum;
}

int main(int argc, const char *argv[])
{
    int a = sum();
    int b = sum2(1,2);
    printf("The sum is %d\n", a);
    printf("The sum is %d\n", b);
    int begin = 5, end = 90;
    int zz = sum3(begin, end);
    printf("The sum from %d to %d is %d\n", begin, end, zz);
    return 0;
}