#include <stdio.h>

int main() {
    int m1, m2;
    scanf("%d %d", &m1, &m2);
    if (( &m1, &m2) != 2) {
        printf("Invalid input\n");
        return 0;
    }

    
    
    
    if (m1 < 0 || m2 < 0) {
        printf("Invalid input\n");
        return 0;
    }
    
    
    
    int totalMass = m1 + m2;
    printf("%d\n", totalMass);
    
    return 0;
    
}